72646714521 has 6 divisors (see below), whose sum is σ = 104934143210. Its totient is φ = 48431143008.

The previous prime is 72646714477. The next prime is 72646714523. The reversal of 72646714521 is 12541764627.

72646714521 is a `hidden beast` number, since 7 + 2 + 64 + 67 + 1 + 4 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 69798998025 + 2847716496 = 264195^2 + 53364^2 .

It is not a de Polignac number, because 72646714521 - 2⁶ = 72646714457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72646714523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4035928576 + ... + 4035928593.

Almost surely, 2^72646714521 is an apocalyptic number.

It is an amenable number.

72646714521 is a deficient number, since it is larger than the sum of its proper divisors (32287428689).

72646714521 is a wasteful number, since it uses less digits than its factorization.

72646714521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071857175 (or 8071857172 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The spelling of 72646714521 in words is "seventy-two billion, six hundred forty-six million, seven hundred fourteen thousand, five hundred twenty-one".