72653639985 has 16 divisors (see below), whose sum is σ = 129162026880. Its totient is φ = 38748607920.

The previous prime is 72653639977. The next prime is 72653640013. The reversal of 72653639985 is 58993635627.

72653639985 is a `hidden beast` number, since 7 + 2 + 6 + 536 + 3 + 9 + 98 + 5 = 666.

It is not a de Polignac number, because 72653639985 - 2³ = 72653639977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269087421 + ... + 269087690.

It is an arithmetic number, because the mean of its divisors is an integer number (8072626680).

Almost surely, 2^72653639985 is an apocalyptic number.

It is an amenable number.

72653639985 is a deficient number, since it is larger than the sum of its proper divisors (56508386895).

72653639985 is a wasteful number, since it uses less digits than its factorization.

72653639985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538175125 (or 538175119 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 63.

The spelling of 72653639985 in words is "seventy-two billion, six hundred fifty-three million, six hundred thirty-nine thousand, nine hundred eighty-five".