51438903656464 has 15 divisors (see below), whose sum is σ = 99662931418143. Its totient is φ = 25719437484048.

The previous prime is 51438903656453. The next prime is 51438903656467. The reversal of 51438903656464 is 46465630983415.

The square root of 51438903656464 is 7172092.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51438903656396 and 51438903656405.

It is not an unprimeable number, because it can be changed into a prime (51438903656467) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 27791857 + ... + 29584879.

Almost surely, 2^{51438903656464} is an apocalyptic number.

51438903656464 is the 7172092-nd square number.

It is an amenable number.

51438903656464 is a deficient number, since it is larger than the sum of its proper divisors (48224027761679).

51438903656464 is an frugal number, since it uses more digits than its factorization.

51438903656464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586054 (or 1793025 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 64.

The spelling of 51438903656464 in words is "fifty-one trillion, four hundred thirty-eight billion, nine hundred three million, six hundred fifty-six thousand, four hundred sixty-four".