51396332645 has 32 divisors (see below), whose sum is σ = 74815488000. Its totient is φ = 33088813056.

The previous prime is 51396332621. The next prime is 51396332683. The reversal of 51396332645 is 54623369315.

It is not a de Polignac number, because 51396332645 - 2¹⁴ = 51396316261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51396332645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137756 + ... + 348954.

It is an arithmetic number, because the mean of its divisors is an integer number (2337984000).

Almost surely, 2^51396332645 is an apocalyptic number.

It is an amenable number.

51396332645 is a deficient number, since it is larger than the sum of its proper divisors (23419155355).

51396332645 is a wasteful number, since it uses less digits than its factorization.

51396332645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211637.

The product of its digits is 1749600, while the sum is 47.

The spelling of 51396332645 in words is "fifty-one billion, three hundred ninety-six million, three hundred thirty-two thousand, six hundred forty-five".