72420017605631 has 16 divisors (see below), whose sum is σ = 74007673491456. Its totient is φ = 70845431100000.

The previous prime is 72420017605619. The next prime is 72420017605643. The reversal of 72420017605631 is 13650671002427.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72420017605619) and next prime (72420017605643).

It is a cyclic number.

It is not a de Polignac number, because 72420017605631 - 2¹⁴ = 72420017589247 is a prime.

It is a super-2 number, since 2×72420017605631² (a number of 29 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 (72420017605681) 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, 56820806 + ... + 58081356.

It is an arithmetic number, because the mean of its divisors is an integer number (4625479593216).

Almost surely, 2^{72420017605631} is an apocalyptic number.

72420017605631 is a deficient number, since it is larger than the sum of its proper divisors (1587655885825).

72420017605631 is a wasteful number, since it uses less digits than its factorization.

72420017605631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265734.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 72420017605631 in words is "seventy-two trillion, four hundred twenty billion, seventeen million, six hundred five thousand, six hundred thirty-one".