51386498665 has 16 divisors (see below), whose sum is σ = 61832263680. Its totient is φ = 40996970560.

The previous prime is 51386498629. The next prime is 51386498671. The reversal of 51386498665 is 56689468315.

It is not a de Polignac number, because 51386498665 - 2²³ = 51378110057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9731496 + ... + 9736774.

It is an arithmetic number, because the mean of its divisors is an integer number (3864516480).

Almost surely, 2^51386498665 is an apocalyptic number.

It is an amenable number.

51386498665 is a deficient number, since it is larger than the sum of its proper divisors (10445765015).

51386498665 is a wasteful number, since it uses less digits than its factorization.

51386498665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its digits is 37324800, while the sum is 61.

The spelling of 51386498665 in words is "fifty-one billion, three hundred eighty-six million, four hundred ninety-eight thousand, six hundred sixty-five".