51605617667 has 4 divisors (see below), whose sum is σ = 51606729720. Its totient is φ = 51604505616.

The previous prime is 51605617589. The next prime is 51605617699. The reversal of 51605617667 is 76671650615.

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

It is a cyclic number.

It is not a de Polignac number, because 51605617667 - 2⁸ = 51605617411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51605611667) by changing a digit.

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, 483242 + ... + 580287.

It is an arithmetic number, because the mean of its divisors is an integer number (12901682430).

Almost surely, 2^51605617667 is an apocalyptic number.

51605617667 is a deficient number, since it is larger than the sum of its proper divisors (1112053).

51605617667 is a wasteful number, since it uses less digits than its factorization.

51605617667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112052.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 51605617667 in words is "fifty-one billion, six hundred five million, six hundred seventeen thousand, six hundred sixty-seven".