16621616631 has 16 divisors (see below), whose sum is σ = 22248457056. Its totient is φ = 11037964416.

The previous prime is 16621616621. The next prime is 16621616639. The reversal of 16621616631 is 13661612661.

It is not a de Polignac number, because 16621616631 - 2¹³ = 16621608439 is a prime.

It is a super-2 number, since 2×16621616631² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16621616631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621616639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2856481 + ... + 2862293.

It is an arithmetic number, because the mean of its divisors is an integer number (1390528566).

Almost surely, 2^16621616631 is an apocalyptic number.

16621616631 is a deficient number, since it is larger than the sum of its proper divisors (5626840425).

16621616631 is a wasteful number, since it uses less digits than its factorization.

16621616631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362.

The product of its digits is 46656, while the sum is 39.

The spelling of 16621616631 in words is "sixteen billion, six hundred twenty-one million, six hundred sixteen thousand, six hundred thirty-one".