625643655 has 64 divisors (see below), whose sum is σ = 1250608128. Its totient is φ = 260029440.

The previous prime is 625643569. The next prime is 625643657. The reversal of 625643655 is 556346526.

It is not a de Polignac number, because 625643655 - 2⁸ = 625643399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625643657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88035 + ... + 94875.

It is an arithmetic number, because the mean of its divisors is an integer number (19540752).

Almost surely, 2^625643655 is an apocalyptic number.

625643655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

625643655 is a deficient number, since it is larger than the sum of its proper divisors (624964473).

625643655 is a wasteful number, since it uses less digits than its factorization.

625643655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936.

The product of its digits is 648000, while the sum is 42.

The square root of 625643655 is about 25012.8697873715. The cubic root of 625643655 is about 855.2813751931.

The spelling of 625643655 in words is "six hundred twenty-five million, six hundred forty-three thousand, six hundred fifty-five".