74523721556 has 12 divisors (see below), whose sum is σ = 130555704468. Its totient is φ = 37222091712.

The previous prime is 74523721543. The next prime is 74523721577. The reversal of 74523721556 is 65512732547.

It can be written as a sum of positive squares in 2 ways, for example, as 18473159056 + 56050562500 = 135916^2 + 236750^2 .

It is a super-2 number, since 2×74523721556² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 74523721556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9938051 + ... + 9945546.

It is an arithmetic number, because the mean of its divisors is an integer number (10879642039).

Almost surely, 2^74523721556 is an apocalyptic number.

It is an amenable number.

74523721556 is a deficient number, since it is larger than the sum of its proper divisors (56031982912).

74523721556 is a wasteful number, since it uses less digits than its factorization.

74523721556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19884538 (or 19884536 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 47.

The spelling of 74523721556 in words is "seventy-four billion, five hundred twenty-three million, seven hundred twenty-one thousand, five hundred fifty-six".