51405989468 has 24 divisors (see below), whose sum is σ = 90328791168. Its totient is φ = 25597821296.

The previous prime is 51405989449. The next prime is 51405989497. The reversal of 51405989468 is 86498950415.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6142655 + ... + 6151017.

It is an arithmetic number, because the mean of its divisors is an integer number (3763699632).

Almost surely, 2^51405989468 is an apocalyptic number.

It is an amenable number.

51405989468 is a deficient number, since it is larger than the sum of its proper divisors (38922801700).

51405989468 is a wasteful number, since it uses less digits than its factorization.

51405989468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14473 (or 14471 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 51405989468 in words is "fifty-one billion, four hundred five million, nine hundred eighty-nine thousand, four hundred sixty-eight".