581380351656 has 64 divisors (see below), whose sum is σ = 1574516798400. Its totient is φ = 178886245824.

The previous prime is 581380351613. The next prime is 581380351667. The reversal of 581380351656 is 656153083185.

It is a super-2 number, since 2×581380351656² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 581380351599 and 581380351608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5460286 + ... + 5565741.

It is an arithmetic number, because the mean of its divisors is an integer number (24601824975).

Almost surely, 2^581380351656 is an apocalyptic number.

It is an amenable number.

581380351656 is an abundant number, since it is smaller than the sum of its proper divisors (993136446744).

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

581380351656 is a wasteful number, since it uses less digits than its factorization.

581380351656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026075 (or 11026045 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 581380351656 in words is "five hundred eighty-one billion, three hundred eighty million, three hundred fifty-one thousand, six hundred fifty-six".