125555155566 has 16 divisors (see below), whose sum is σ = 251114428800. Its totient is φ = 41851032248.

The previous prime is 125555155483. The next prime is 125555155573. The reversal of 125555155566 is 665551555521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344005 + ... + 607823.

It is an arithmetic number, because the mean of its divisors is an integer number (15694651800).

Almost surely, 2^125555155566 is an apocalyptic number.

125555155566 is an abundant number, since it is smaller than the sum of its proper divisors (125559273234).

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

125555155566 is a wasteful number, since it uses less digits than its factorization.

125555155566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343143.

The product of its digits is 5625000, while the sum is 51.

The spelling of 125555155566 in words is "one hundred twenty-five billion, five hundred fifty-five million, one hundred fifty-five thousand, five hundred sixty-six".