125561655 has 12 divisors (see below), whose sum is σ = 217640280. Its totient is φ = 66966192.

The previous prime is 125561651. The next prime is 125561699. The reversal of 125561655 is 556165521.

It is not a de Polignac number, because 125561655 - 2² = 125561651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125561651) 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, 1395085 + ... + 1395174.

It is an arithmetic number, because the mean of its divisors is an integer number (18136690).

Almost surely, 2^125561655 is an apocalyptic number.

125561655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125561655 is a deficient number, since it is larger than the sum of its proper divisors (92078625).

125561655 is a wasteful number, since it uses less digits than its factorization.

125561655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790270 (or 2790267 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 125561655 is about 11205.4297106358. The cubic root of 125561655 is about 500.7477545023.

The spelling of 125561655 in words is "one hundred twenty-five million, five hundred sixty-one thousand, six hundred fifty-five".