6251555655 has 48 divisors (see below), whose sum is σ = 11474910720. Its totient is φ = 3139694784.

The previous prime is 6251555627. The next prime is 6251555671. The reversal of 6251555655 is 5565551526.

6251555655 is a `hidden beast` number, since 625 + 15 + 5 + 5 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 6251555655 - 2⁶ = 6251555591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6251555655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120894 + ... + 164676.

It is an arithmetic number, because the mean of its divisors is an integer number (239060640).

Almost surely, 2^6251555655 is an apocalyptic number.

6251555655 is a deficient number, since it is larger than the sum of its proper divisors (5223355065).

6251555655 is a wasteful number, since it uses less digits than its factorization.

6251555655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43980 (or 43977 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The square root of 6251555655 is about 79066.7797181598. The cubic root of 6251555655 is about 1842.1685654959.

The spelling of 6251555655 in words is "six billion, two hundred fifty-one million, five hundred fifty-five thousand, six hundred fifty-five".