125555155565856 has 48 divisors (see below), whose sum is σ = 340213969928448. Its totient is φ = 40501663084800.

The previous prime is 125555155565843. The next prime is 125555155565891. The reversal of 125555155565856 is 658565551555521.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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, 21094613215 + ... + 21094619166.

It is an arithmetic number, because the mean of its divisors is an integer number (7087791040176).

Almost surely, 2^{125555155565856} is an apocalyptic number.

125555155565856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

125555155565856 is an abundant number, since it is smaller than the sum of its proper divisors (214658814362592).

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

125555155565856 is a wasteful number, since it uses less digits than its factorization.

125555155565856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42189232425 (or 42189232417 counting only the distinct ones).

The product of its digits is 1125000000, while the sum is 69.

The spelling of 125555155565856 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-six".