52012507581 has 24 divisors (see below), whose sum is σ = 79282650720. Its totient is φ = 32767216416.

The previous prime is 52012507571. The next prime is 52012507649. The reversal of 52012507581 is 18570521025.

52012507581 is a `hidden beast` number, since 5 + 20 + 1 + 2 + 50 + 7 + 581 = 666.

It is not a de Polignac number, because 52012507581 - 2⁹ = 52012507069 is a prime.

It is a super-2 number, since 2×52012507581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52012507531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 315195 + ... + 450968.

It is an arithmetic number, because the mean of its divisors is an integer number (3303443780).

Almost surely, 2^52012507581 is an apocalyptic number.

It is an amenable number.

52012507581 is a deficient number, since it is larger than the sum of its proper divisors (27270143139).

52012507581 is a wasteful number, since it uses less digits than its factorization.

52012507581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766585 (or 766582 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The spelling of 52012507581 in words is "fifty-two billion, twelve million, five hundred seven thousand, five hundred eighty-one".