72551781711 has 6 divisors (see below), whose sum is σ = 104797018040. Its totient is φ = 48367854468.

The previous prime is 72551781707. The next prime is 72551781719. The reversal of 72551781711 is 11718715527.

72551781711 is a `hidden beast` number, since 7 + 2 + 551 + 7 + 81 + 7 + 11 = 666.

It is not a de Polignac number, because 72551781711 - 2² = 72551781707 is a prime.

It is a super-2 number, since 2×72551781711² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551781719) 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, 4030654531 + ... + 4030654548.

Almost surely, 2^72551781711 is an apocalyptic number.

72551781711 is a deficient number, since it is larger than the sum of its proper divisors (32245236329).

72551781711 is a wasteful number, since it uses less digits than its factorization.

72551781711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8061309085 (or 8061309082 counting only the distinct ones).

The product of its digits is 137200, while the sum is 45.

The spelling of 72551781711 in words is "seventy-two billion, five hundred fifty-one million, seven hundred eighty-one thousand, seven hundred eleven".