51330379665 has 16 divisors (see below), whose sum is σ = 83520619200. Its totient is φ = 26912198592.

The previous prime is 51330379663. The next prime is 51330379687. The reversal of 51330379665 is 56697303315.

It is a happy number.

It is not a de Polignac number, because 51330379665 - 2¹ = 51330379663 is a prime.

51330379665 is a modest number, since divided by 379665 gives 51330 as remainder.

It is not an unprimeable number, because it can be changed into a prime (51330379663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28999330 + ... + 29001099.

It is an arithmetic number, because the mean of its divisors is an integer number (5220038700).

Almost surely, 2^51330379665 is an apocalyptic number.

It is an amenable number.

51330379665 is a deficient number, since it is larger than the sum of its proper divisors (32190239535).

51330379665 is a wasteful number, since it uses less digits than its factorization.

51330379665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58000496.

The product of its (nonzero) digits is 1530900, while the sum is 48.

The spelling of 51330379665 in words is "fifty-one billion, three hundred thirty million, three hundred seventy-nine thousand, six hundred sixty-five".