72581630577 has 16 divisors (see below), whose sum is σ = 103911403392. Its totient is φ = 44899984640.

The previous prime is 72581630557. The next prime is 72581630579. The reversal of 72581630577 is 77503618527.

It is a cyclic number.

It is not a de Polignac number, because 72581630577 - 2⁸ = 72581630321 is a prime.

It is a super-2 number, since 2×72581630577² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (72581630579) 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, 10018698 + ... + 10025939.

It is an arithmetic number, because the mean of its divisors is an integer number (6494462712).

Almost surely, 2^72581630577 is an apocalyptic number.

It is an amenable number.

72581630577 is a deficient number, since it is larger than the sum of its proper divisors (31329772815).

72581630577 is a wasteful number, since it uses less digits than its factorization.

72581630577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044728.

The product of its (nonzero) digits is 2469600, while the sum is 51.

The spelling of 72581630577 in words is "seventy-two billion, five hundred eighty-one million, six hundred thirty thousand, five hundred seventy-seven".