16849937621 has 4 divisors (see below), whose sum is σ = 18381750144. Its totient is φ = 15318125100.

The previous prime is 16849937593. The next prime is 16849937623. The reversal of 16849937621 is 12673994861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16849937621 is a prime.

It is a super-2 number, since 2×16849937621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16849937623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765906245 + ... + 765906266.

It is an arithmetic number, because the mean of its divisors is an integer number (4595437536).

Almost surely, 2^16849937621 is an apocalyptic number.

16849937621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16849937621 is a deficient number, since it is larger than the sum of its proper divisors (1531812523).

16849937621 is a wasteful number, since it uses less digits than its factorization.

16849937621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531812522.

The product of its digits is 3919104, while the sum is 56.

The spelling of 16849937621 in words is "sixteen billion, eight hundred forty-nine million, nine hundred thirty-seven thousand, six hundred twenty-one".