652257879858 has 126 divisors (see below), whose sum is σ = 1589405179149. Its totient is φ = 200571379632.

The previous prime is 652257879853. The next prime is 652257879893. The reversal of 652257879858 is 858978752256.

It is a happy number.

652257879858 is a `hidden beast` number, since 6 + 522 + 5 + 7 + 8 + 7 + 98 + 5 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 557699784849 + 94558095009 = 746793^2 + 307503^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=571077.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (652257879853) by changing a digit.

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 62 ways as a sum of consecutive naturals, for example, 400895241 + ... + 400896867.

Almost surely, 2^652257879858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 652257879858

652257879858 is an abundant number, since it is smaller than the sum of its proper divisors (937147299291).

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

652257879858 is an frugal number, since it uses more digits than its factorization.

652257879858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300 (or 1645 counting only the distinct ones).

The product of its digits is 677376000, while the sum is 72.

Multiplying 652257879858 by its sum of digits (72), we get a square (46962567349776 = 6852924²).

The spelling of 652257879858 in words is "six hundred fifty-two billion, two hundred fifty-seven million, eight hundred seventy-nine thousand, eight hundred fifty-eight".