51699491393 has 8 divisors (see below), whose sum is σ = 56805198240. Its totient is φ = 46661410080.

The previous prime is 51699491377. The next prime is 51699491411. The reversal of 51699491393 is 39319499615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51699491393 - 2⁴ = 51699491377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51699497393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16904780 + ... + 16907837.

It is an arithmetic number, because the mean of its divisors is an integer number (7100649780).

Almost surely, 2^51699491393 is an apocalyptic number.

It is an amenable number.

51699491393 is a deficient number, since it is larger than the sum of its proper divisors (5105706847).

51699491393 is a wasteful number, since it uses less digits than its factorization.

51699491393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33812767.

The product of its digits is 7085880, while the sum is 59.

The spelling of 51699491393 in words is "fifty-one billion, six hundred ninety-nine million, four hundred ninety-one thousand, three hundred ninety-three".