9939991698253 has 4 divisors (see below), whose sum is σ = 9939998386300. Its totient is φ = 9939985010208.

The previous prime is 9939991698251. The next prime is 9939991698311. The reversal of 9939991698253 is 3528961999399.

9939991698253 is a nontrivial binomial coefficient, being equal to C(4458698, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8061891386409 + 1878100311844 = 2839347^2 + 1370438^2 .

It is a 3-Lehmer number, since φ(9939991698253) divides (9939991698253-1)³.

It is a cyclic number.

It is not a de Polignac number, because 9939991698253 - 2¹ = 9939991698251 is a prime.

It is a super-2 number, since 2×9939991698253² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9939991698251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 4458697.

It is an arithmetic number, because the mean of its divisors is an integer number (2484999596575).

It is a Poulet number, since it divides 2^{9939991698252}-1.

Almost surely, 2^{9939991698253} is an apocalyptic number.

9939991698253 is the 4458697-th triangular number and also the 2229349-th hexagonal number.

9939991698253 is the 1486233-rd centered nonagonal number.

It is an amenable number.

9939991698253 is a deficient number, since it is larger than the sum of its proper divisors (6688047).

9939991698253 is a wasteful number, since it uses less digits than its factorization.

9939991698253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688046.

The product of its digits is 2295825120, while the sum is 82.

The spelling of 9939991698253 in words is "nine trillion, nine hundred thirty-nine billion, nine hundred ninety-one million, six hundred ninety-eight thousand, two hundred fifty-three".