56721521272 has 32 divisors (see below), whose sum is σ = 115408172880. Its totient is φ = 25979316480.

The previous prime is 56721521267. The next prime is 56721521279. The reversal of 56721521272 is 27212512765.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56721521279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068053 + ... + 2095300.

Almost surely, 2^56721521272 is an apocalyptic number.

56721521272 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

56721521272 is an abundant number, since it is smaller than the sum of its proper divisors (58686651608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56721521272 is a wasteful number, since it uses less digits than its factorization.

56721521272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163503 (or 4163499 counting only the distinct ones).

The product of its digits is 117600, while the sum is 40.

The spelling of 56721521272 in words is "fifty-six billion, seven hundred twenty-one million, five hundred twenty-one thousand, two hundred seventy-two".