581720520957 has 4 divisors (see below), whose sum is σ = 775627361280. Its totient is φ = 387813680636.

The previous prime is 581720520943. The next prime is 581720520959. The reversal of 581720520957 is 759025027185.

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.

It is a cyclic number.

It is not a de Polignac number, because 581720520957 - 2⁸ = 581720520701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581720520959) 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, 96953420157 + ... + 96953420162.

It is an arithmetic number, because the mean of its divisors is an integer number (193906840320).

Almost surely, 2^581720520957 is an apocalyptic number.

It is an amenable number.

581720520957 is a deficient number, since it is larger than the sum of its proper divisors (193906840323).

581720520957 is a wasteful number, since it uses less digits than its factorization.

581720520957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193906840322.

The product of its (nonzero) digits is 1764000, while the sum is 51.

The spelling of 581720520957 in words is "five hundred eighty-one billion, seven hundred twenty million, five hundred twenty thousand, nine hundred fifty-seven".