9902636549 has 8 divisors (see below), whose sum is σ = 10665916632. Its totient is φ = 9139576320.

The previous prime is 9902636509. The next prime is 9902636567. The reversal of 9902636549 is 9456362099.

9902636549 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 823977025 + 9078659524 = 28705^2 + 95282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9902636549 - 2²⁰ = 9901587973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9902636549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9902636509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45389 + ... + 147869.

It is an arithmetic number, because the mean of its divisors is an integer number (1333239579).

Almost surely, 2^9902636549 is an apocalyptic number.

It is an amenable number.

9902636549 is a deficient number, since it is larger than the sum of its proper divisors (763280083).

9902636549 is a wasteful number, since it uses less digits than its factorization.

9902636549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109927.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The square root of 9902636549 is about 99511.9919858908. The cubic root of 9902636549 is about 2147.4197674171.

The spelling of 9902636549 in words is "nine billion, nine hundred two million, six hundred thirty-six thousand, five hundred forty-nine".