17640621616 has 40 divisors (see below), whose sum is σ = 34412511744. Its totient is φ = 8760183360.

The previous prime is 17640621563. The next prime is 17640621619. The reversal of 17640621616 is 61612604671.

It is a super-2 number, since 2×17640621616² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17640621619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1401945 + ... + 1414471.

Almost surely, 2^17640621616 is an apocalyptic number.

17640621616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

17640621616 is a deficient number, since it is larger than the sum of its proper divisors (16771890128).

17640621616 is a wasteful number, since it uses less digits than its factorization.

17640621616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13129 (or 13123 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 17640621616 in words is "seventeen billion, six hundred forty million, six hundred twenty-one thousand, six hundred sixteen".