51900361988 has 6 divisors (see below), whose sum is σ = 90825633486. Its totient is φ = 25950180992.

The previous prime is 51900361979. The next prime is 51900361991. The reversal of 51900361988 is 88916300915.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 37357931524 + 14542430464 = 193282^2 + 120592^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6487545245 + ... + 6487545252.

It is an arithmetic number, because the mean of its divisors is an integer number (15137605581).

Almost surely, 2^51900361988 is an apocalyptic number.

It is an amenable number.

51900361988 is a deficient number, since it is larger than the sum of its proper divisors (38925271498).

51900361988 is a wasteful number, since it uses less digits than its factorization.

51900361988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12975090501 (or 12975090499 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 51900361988 in words is "fifty-one billion, nine hundred million, three hundred sixty-one thousand, nine hundred eighty-eight".