51015021671655 has 24 divisors (see below), whose sum is σ = 88545693965040. Its totient is φ = 27171194204160.

The previous prime is 51015021671651. The next prime is 51015021671681. The reversal of 51015021671655 is 55617612051015.

51015021671655 is a `hidden beast` number, since 5 + 1 + 0 + 1 + 502 + 16 + 71 + 65 + 5 = 666.

It is not a de Polignac number, because 51015021671655 - 2² = 51015021671651 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 51015021671655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51015021671651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 766994586 + ... + 767061095.

It is an arithmetic number, because the mean of its divisors is an integer number (3689403915210).

Almost surely, 2^{51015021671655} is an apocalyptic number.

51015021671655 is a deficient number, since it is larger than the sum of its proper divisors (37530672293385).

51015021671655 is a wasteful number, since it uses less digits than its factorization.

51015021671655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534056431 (or 1534056428 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 45.

The spelling of 51015021671655 in words is "fifty-one trillion, fifteen billion, twenty-one million, six hundred seventy-one thousand, six hundred fifty-five".