125725531635 has 24 divisors (see below), whose sum is σ = 237735551664. Its totient is φ = 60957833280.

The previous prime is 125725531537. The next prime is 125725531643. The reversal of 125725531635 is 536135527521.

125725531635 is a `hidden beast` number, since 1 + 2 + 5 + 7 + 2 + 5 + 5 + 3 + 1 + 635 = 666.

It is not a de Polignac number, because 125725531635 - 2¹⁵ = 125725498867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 126994992 + ... + 126995981.

It is an arithmetic number, because the mean of its divisors is an integer number (9905647986).

Almost surely, 2^125725531635 is an apocalyptic number.

125725531635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125725531635 is a deficient number, since it is larger than the sum of its proper divisors (112010020029).

125725531635 is a wasteful number, since it uses less digits than its factorization.

125725531635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253990995 (or 253990992 counting only the distinct ones).

The product of its digits is 945000, while the sum is 45.

The spelling of 125725531635 in words is "one hundred twenty-five billion, seven hundred twenty-five million, five hundred thirty-one thousand, six hundred thirty-five".