51701672665 has 4 divisors (see below), whose sum is σ = 62042007204. Its totient is φ = 41361338128.

The previous prime is 51701672657. The next prime is 51701672689. The reversal of 51701672665 is 56627610715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15486060249 + 36215612416 = 124443^2 + 190304^2 .

It is a cyclic number.

It is not a de Polignac number, because 51701672665 - 2³ = 51701672657 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 5170167262 + ... + 5170167271.

It is an arithmetic number, because the mean of its divisors is an integer number (15510501801).

Almost surely, 2^51701672665 is an apocalyptic number.

It is an amenable number.

51701672665 is a deficient number, since it is larger than the sum of its proper divisors (10340334539).

51701672665 is a wasteful number, since it uses less digits than its factorization.

51701672665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10340334538.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 51701672665 in words is "fifty-one billion, seven hundred one million, six hundred seventy-two thousand, six hundred sixty-five".