72136661564 has 24 divisors (see below), whose sum is σ = 137903385648. Its totient is φ = 32744643840.

The previous prime is 72136661563. The next prime is 72136661633. The reversal of 72136661564 is 46516663127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72136661563) 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, 1086077 + ... + 1150580.

It is an arithmetic number, because the mean of its divisors is an integer number (5745974402).

Almost surely, 2^72136661564 is an apocalyptic number.

It is an amenable number.

72136661564 is a deficient number, since it is larger than the sum of its proper divisors (65766724084).

72136661564 is a wasteful number, since it uses less digits than its factorization.

72136661564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237405 (or 2237403 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The spelling of 72136661564 in words is "seventy-two billion, one hundred thirty-six million, six hundred sixty-one thousand, five hundred sixty-four".