51789773581631 has 4 divisors (see below), whose sum is σ = 51798842012064. Its totient is φ = 51780705151200.

The previous prime is 51789773581607. The next prime is 51789773581649. The reversal of 51789773581631 is 13618537798715.

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 51789773581631 - 2²⁶ = 51789706472767 is a prime.

It is a super-2 number, since 2×51789773581631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51789773581331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4534206650 + ... + 4534218071.

It is an arithmetic number, because the mean of its divisors is an integer number (12949710503016).

Almost surely, 2^{51789773581631} is an apocalyptic number.

51789773581631 is a deficient number, since it is larger than the sum of its proper divisors (9068430433).

51789773581631 is an equidigital number, since it uses as much as digits as its factorization.

51789773581631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9068430432.

The product of its digits is 266716800, while the sum is 71.

The spelling of 51789773581631 in words is "fifty-one trillion, seven hundred eighty-nine billion, seven hundred seventy-three million, five hundred eighty-one thousand, six hundred thirty-one".