51505604994 has 32 divisors (see below), whose sum is σ = 103192770240. Its totient is φ = 17138304000.

The previous prime is 51505604971. The next prime is 51505605031. The reversal of 51505604994 is 49940650515.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 12712269 + ... + 12716319.

It is an arithmetic number, because the mean of its divisors is an integer number (3224774070).

Almost surely, 2^51505604994 is an apocalyptic number.

51505604994 is an abundant number, since it is smaller than the sum of its proper divisors (51687165246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51505604994 is a wasteful number, since it uses less digits than its factorization.

51505604994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 51505604994 in words is "fifty-one billion, five hundred five million, six hundred four thousand, nine hundred ninety-four".