72757782081 has 6 divisors (see below), whose sum is σ = 105094574130. Its totient is φ = 48505188048.

The previous prime is 72757782079. The next prime is 72757782101. The reversal of 72757782081 is 18028775727.

It can be written as a sum of positive squares in only one way, i.e., 42419109681 + 30338672400 = 205959^2 + 174180^2 .

It is not a de Polignac number, because 72757782081 - 2¹ = 72757782079 is a prime.

It is a super-2 number, since 2×72757782081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72757712081) 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, 4042098996 + ... + 4042099013.

It is an arithmetic number, because the mean of its divisors is an integer number (17515762355).

Almost surely, 2^72757782081 is an apocalyptic number.

It is an amenable number.

72757782081 is a deficient number, since it is larger than the sum of its proper divisors (32336792049).

72757782081 is a wasteful number, since it uses less digits than its factorization.

72757782081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8084198015 (or 8084198012 counting only the distinct ones).

The product of its (nonzero) digits is 3073280, while the sum is 54.

The spelling of 72757782081 in words is "seventy-two billion, seven hundred fifty-seven million, seven hundred eighty-two thousand, eighty-one".