51634344645 has 56 divisors (see below), whose sum is σ = 100045516536. Its totient is φ = 25419961728.

The previous prime is 51634344611. The next prime is 51634344677. The reversal of 51634344645 is 54644343615.

51634344645 is a `hidden beast` number, since 5 + 1 + 634 + 3 + 4 + 4 + 6 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1908466596 + 49725878049 = 43686^2 + 222993^2 .

It is not a de Polignac number, because 51634344645 - 2⁶ = 51634344581 is a prime.

It is a super-2 number, since 2×51634344645² (a number of 22 digits) contains 22 as substring.

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 51634344645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 497454 + ... + 592223.

It is an arithmetic number, because the mean of its divisors is an integer number (1786527081).

Almost surely, 2^51634344645 is an apocalyptic number.

It is an amenable number.

51634344645 is a deficient number, since it is larger than the sum of its proper divisors (48411171891).

51634344645 is a wasteful number, since it uses less digits than its factorization.

51634344645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089713 (or 1089698 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

The spelling of 51634344645 in words is "fifty-one billion, six hundred thirty-four million, three hundred forty-four thousand, six hundred forty-five".