125555155565855 has 4 divisors (see below), whose sum is σ = 150666186679032. Its totient is φ = 100444124452680.

The previous prime is 125555155565843. The next prime is 125555155565891. The reversal of 125555155565855 is 558565551555521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 125555155565855 - 2⁸ = 125555155565599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12555515556581 + ... + 12555515556590.

It is an arithmetic number, because the mean of its divisors is an integer number (37666546669758).

Almost surely, 2^{125555155565855} is an apocalyptic number.

125555155565855 is a deficient number, since it is larger than the sum of its proper divisors (25111031113177).

125555155565855 is an equidigital number, since it uses as much as digits as its factorization.

125555155565855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25111031113176.

The product of its digits is 937500000, while the sum is 68.

The spelling of 125555155565855 in words is "one hundred twenty-five trillion, five hundred fifty-five billion, one hundred fifty-five million, five hundred sixty-five thousand, eight hundred fifty-five".