72015636664 has 32 divisors (see below), whose sum is σ = 142934022000. Its totient is φ = 33957649152.

The previous prime is 72015636661. The next prime is 72015636703. The reversal of 72015636664 is 46663651027.

It is a super-2 number, since 2×72015636664² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72015636661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3599469 + ... + 3619420.

Almost surely, 2^72015636664 is an apocalyptic number.

It is an amenable number.

72015636664 is a deficient number, since it is larger than the sum of its proper divisors (70918385336).

72015636664 is a wasteful number, since it uses less digits than its factorization.

72015636664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218967 (or 7218963 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 72015636664 in words is "seventy-two billion, fifteen million, six hundred thirty-six thousand, six hundred sixty-four".