51665277538 has 16 divisors (see below), whose sum is σ = 88800307200. Its totient is φ = 22084446816.

The previous prime is 51665277511. The next prime is 51665277551. The reversal of 51665277538 is 83577256615.

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, 4812363 + ... + 4823086.

It is an arithmetic number, because the mean of its divisors is an integer number (5550019200).

Almost surely, 2^51665277538 is an apocalyptic number.

51665277538 is a deficient number, since it is larger than the sum of its proper divisors (37135029662).

51665277538 is a wasteful number, since it uses less digits than its factorization.

51665277538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9635841.

The product of its digits is 10584000, while the sum is 55.

The spelling of 51665277538 in words is "fifty-one billion, six hundred sixty-five million, two hundred seventy-seven thousand, five hundred thirty-eight".