125542605123 has 12 divisors (see below), whose sum is σ = 195288497040. Its totient is φ = 77256987696.

The previous prime is 125542605103. The next prime is 125542605137. The reversal of 125542605123 is 321506245521.

125542605123 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 42 + 605 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 125542605123 - 2²⁵ = 125509050691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125542605103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 536506743 + ... + 536506976.

It is an arithmetic number, because the mean of its divisors is an integer number (16274041420).

Almost surely, 2^125542605123 is an apocalyptic number.

125542605123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

125542605123 is a deficient number, since it is larger than the sum of its proper divisors (69745891917).

125542605123 is a wasteful number, since it uses less digits than its factorization.

125542605123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073013738 (or 1073013735 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 125542605123 in words is "one hundred twenty-five billion, five hundred forty-two million, six hundred five thousand, one hundred twenty-three".