55971731531520 has 288 divisors, whose sum is σ = 226996467747840. Its totient is φ = 12793538580480.

The previous prime is 55971731531503. The next prime is 55971731531531. The reversal of 55971731531520 is 2513513717955.

55971731531520 is a `hidden beast` number, since 5 + 5 + 9 + 7 + 1 + 7 + 315 + 315 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115440396 + ... + 115924235.

It is an arithmetic number, because the mean of its divisors is an integer number (788182179680).

Almost surely, 2^{55971731531520} is an apocalyptic number.

It is an amenable number.

55971731531520 is an abundant number, since it is smaller than the sum of its proper divisors (171024736216320).

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

55971731531520 is a wasteful number, since it uses less digits than its factorization.

55971731531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231364668 (or 231364648 counting only the distinct ones).

The product of its (nonzero) digits is 4961250, while the sum is 54.

The spelling of 55971731531520 in words is "fifty-five trillion, nine hundred seventy-one billion, seven hundred thirty-one million, five hundred thirty-one thousand, five hundred twenty".