51007745655 has 40 divisors (see below), whose sum is σ = 91724779872. Its totient is φ = 27118245312.

The previous prime is 51007745641. The next prime is 51007745683. The reversal of 51007745655 is 55654770015.

51007745655 is a `hidden beast` number, since 5 + 10 + 0 + 7 + 74 + 565 + 5 = 666.

It is not a de Polignac number, because 51007745655 - 2⁷ = 51007745527 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 51007745655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70267 + ... + 327036.

Almost surely, 2^51007745655 is an apocalyptic number.

51007745655 is a deficient number, since it is larger than the sum of its proper divisors (40717034217).

51007745655 is a wasteful number, since it uses less digits than its factorization.

51007745655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397637 (or 397628 counting only the distinct ones).

The product of its (nonzero) digits is 735000, while the sum is 45.

The spelling of 51007745655 in words is "fifty-one billion, seven million, seven hundred forty-five thousand, six hundred fifty-five".