522399399858 has 54 divisors (see below), whose sum is σ = 1316713815261. Its totient is φ = 149250838464.

The previous prime is 522399399839. The next prime is 522399399869. The reversal of 522399399858 is 858993993225.

522399399858 is a `hidden beast` number, since 5 + 223 + 9 + 9 + 399 + 8 + 5 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 267896302569 + 254503097289 = 517587^2 + 504483^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=511077.

It is a super-2 number, since 2×522399399858² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21453066 + ... + 21477402.

Almost surely, 2^522399399858 is an apocalyptic number.

522399399858 is an abundant number, since it is smaller than the sum of its proper divisors (794314415403).

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

522399399858 is an frugal number, since it uses more digits than its factorization.

522399399858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48696 (or 24349 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 72.

Multiplying 522399399858 by its sum of digits (72), we get a square (37612756789776 = 6132924²).

The spelling of 522399399858 in words is "five hundred twenty-two billion, three hundred ninety-nine million, three hundred ninety-nine thousand, eight hundred fifty-eight".