72711215511 has 32 divisors (see below), whose sum is σ = 109201913856. Its totient is φ = 42634752000.

The previous prime is 72711215471. The next prime is 72711215513. The reversal of 72711215511 is 11551211727.

It is not a de Polignac number, because 72711215511 - 2³⁴ = 55531346327 is a prime.

It is a super-2 number, since 2×72711215511² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72711215513) 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, 5535031 + ... + 5548151.

It is an arithmetic number, because the mean of its divisors is an integer number (3412559808).

Almost surely, 2^72711215511 is an apocalyptic number.

72711215511 is a deficient number, since it is larger than the sum of its proper divisors (36490698345).

72711215511 is a wasteful number, since it uses less digits than its factorization.

72711215511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18583.

The product of its digits is 4900, while the sum is 33.

The spelling of 72711215511 in words is "seventy-two billion, seven hundred eleven million, two hundred fifteen thousand, five hundred eleven".