51502894478 has 32 divisors (see below), whose sum is σ = 92150654400. Its totient is φ = 21127991040.

The previous prime is 51502894447. The next prime is 51502894481. The reversal of 51502894478 is 87449820515.

It is a super-2 number, since 2×51502894478² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816053 + ... + 876896.

It is an arithmetic number, because the mean of its divisors is an integer number (2879707950).

Almost surely, 2^51502894478 is an apocalyptic number.

51502894478 is a deficient number, since it is larger than the sum of its proper divisors (40647759922).

51502894478 is a wasteful number, since it uses less digits than its factorization.

51502894478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693052.

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 51502894478 in words is "fifty-one billion, five hundred two million, eight hundred ninety-four thousand, four hundred seventy-eight".