51591631553279 has 4 divisors (see below), whose sum is σ = 51596555838984. Its totient is φ = 51586707267576.

The previous prime is 51591631553167. The next prime is 51591631553311. The reversal of 51591631553279 is 97235513619515.

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 51591631553279 - 2³⁶ = 51522912076543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51591631553779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2462127137 + ... + 2462148090.

It is an arithmetic number, because the mean of its divisors is an integer number (12899138959746).

Almost surely, 2^{51591631553279} is an apocalyptic number.

51591631553279 is a deficient number, since it is larger than the sum of its proper divisors (4924285705).

51591631553279 is a wasteful number, since it uses less digits than its factorization.

51591631553279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924285704.

The product of its digits is 38272500, while the sum is 62.

The spelling of 51591631553279 in words is "fifty-one trillion, five hundred ninety-one billion, six hundred thirty-one million, five hundred fifty-three thousand, two hundred seventy-nine".