51994968654 has 16 divisors (see below), whose sum is σ = 104808757248. Its totient is φ = 17195186232.

The previous prime is 51994968617. The next prime is 51994968667. The reversal of 51994968654 is 45686949915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34116672 + ... + 34118195.

It is an arithmetic number, because the mean of its divisors is an integer number (6550547328).

Almost surely, 2^51994968654 is an apocalyptic number.

51994968654 is an abundant number, since it is smaller than the sum of its proper divisors (52813788594).

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

51994968654 is a wasteful number, since it uses less digits than its factorization.

51994968654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68234999.

The product of its digits is 83980800, while the sum is 66.

The spelling of 51994968654 in words is "fifty-one billion, nine hundred ninety-four million, nine hundred sixty-eight thousand, six hundred fifty-four".