51305637465 has 32 divisors (see below), whose sum is σ = 91608374400. Its totient is φ = 27243501120.

The previous prime is 51305637377. The next prime is 51305637479. The reversal of 51305637465 is 56473650315.

51305637465 is a `hidden beast` number, since 5 + 1 + 3 + 0 + 5 + 637 + 4 + 6 + 5 = 666.

It is not a de Polignac number, because 51305637465 - 2⁸ = 51305637209 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 51305637465.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 798871 + ... + 860700.

It is an arithmetic number, because the mean of its divisors is an integer number (2862761700).

Almost surely, 2^51305637465 is an apocalyptic number.

It is an amenable number.

51305637465 is a deficient number, since it is larger than the sum of its proper divisors (40302736935).

51305637465 is a wasteful number, since it uses less digits than its factorization.

51305637465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659814 (or 1659808 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

The spelling of 51305637465 in words is "fifty-one billion, three hundred five million, six hundred thirty-seven thousand, four hundred sixty-five".