581536133997972 has 48 divisors (see below), whose sum is σ = 1427581122660672. Its totient is φ = 184006159729920.

The previous prime is 581536133997971. The next prime is 581536133997983. The reversal of 581536133997972 is 279799331635185.

It is a super-2 number, since 2×581536133997972² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581536133997971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15972738718 + ... + 15972775125.

It is an arithmetic number, because the mean of its divisors is an integer number (29741273388764).

Almost surely, 2^{581536133997972} is an apocalyptic number.

It is an amenable number.

581536133997972 is an abundant number, since it is smaller than the sum of its proper divisors (846044988662700).

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

581536133997972 is a wasteful number, since it uses less digits than its factorization.

581536133997972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31945513928 (or 31945513926 counting only the distinct ones).

The product of its digits is 2314720800, while the sum is 78.

The spelling of 581536133997972 in words is "five hundred eighty-one trillion, five hundred thirty-six billion, one hundred thirty-three million, nine hundred ninety-seven thousand, nine hundred seventy-two".