16620640692964 has 243 divisors, whose sum is σ = 38911484361603. Its totient is φ = 6188646156000.

The previous prime is 16620640692961. The next prime is 16620640693037. The reversal of 16620640692964 is 46929604602661.

It is a happy number.

The square root of 16620640692964 is 4076842.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×16620640692964² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16620640692961) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 14440173789 + ... + 14440174939.

Almost surely, 2^{16620640692964} is an apocalyptic number.

16620640692964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

16620640692964 is the 4076842-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16620640692964

16620640692964 is an abundant number, since it is smaller than the sum of its proper divisors (22290843668639).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16620640692964 is a wasteful number, since it uses less digits than its factorization.

16620640692964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 61.

The spelling of 16620640692964 in words is "sixteen trillion, six hundred twenty billion, six hundred forty million, six hundred ninety-two thousand, nine hundred sixty-four".