71937320577 has 4 divisors (see below), whose sum is σ = 95916427440. Its totient is φ = 47958213716.

The previous prime is 71937320519. The next prime is 71937320579. The reversal of 71937320577 is 77502373917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77502373917 = 3 ⋅25834124639.

It is a cyclic number.

It is not a de Polignac number, because 71937320577 - 2⁸ = 71937320321 is a prime.

It is a super-2 number, since 2×71937320577² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71937320579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11989553427 + ... + 11989553432.

It is an arithmetic number, because the mean of its divisors is an integer number (23979106860).

Almost surely, 2^71937320577 is an apocalyptic number.

It is an amenable number.

71937320577 is a deficient number, since it is larger than the sum of its proper divisors (23979106863).

71937320577 is a wasteful number, since it uses less digits than its factorization.

71937320577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23979106862.

The product of its (nonzero) digits is 1944810, while the sum is 51.

The spelling of 71937320577 in words is "seventy-one billion, nine hundred thirty-seven million, three hundred twenty thousand, five hundred seventy-seven".