72357535581 has 32 divisors (see below), whose sum is σ = 102112690176. Its totient is φ = 45501360000.

The previous prime is 72357535577. The next prime is 72357535597. The reversal of 72357535581 is 18553575327.

It is not a de Polignac number, because 72357535581 - 2² = 72357535577 is a prime.

It is a super-2 number, since 2×72357535581² (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 (72357535511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4380520 + ... + 4397006.

It is an arithmetic number, because the mean of its divisors is an integer number (3191021568).

Almost surely, 2^72357535581 is an apocalyptic number.

It is an amenable number.

72357535581 is a deficient number, since it is larger than the sum of its proper divisors (29755154595).

72357535581 is a wasteful number, since it uses less digits than its factorization.

72357535581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17713.

The product of its digits is 4410000, while the sum is 51.

The spelling of 72357535581 in words is "seventy-two billion, three hundred fifty-seven million, five hundred thirty-five thousand, five hundred eighty-one".