51940794581 has 16 divisors (see below), whose sum is σ = 56077056000. Its totient is φ = 47824791168.

The previous prime is 51940794557. The next prime is 51940794599. The reversal of 51940794581 is 18549704915.

51940794581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51940794581 - 2⁶ = 51940794517 is a prime.

It is a super-2 number, since 2×51940794581² (a number of 22 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 (51940794541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17743940 + ... + 17746866.

It is an arithmetic number, because the mean of its divisors is an integer number (3504816000).

Almost surely, 2^51940794581 is an apocalyptic number.

It is an amenable number.

51940794581 is a deficient number, since it is larger than the sum of its proper divisors (4136261419).

51940794581 is a wasteful number, since it uses less digits than its factorization.

51940794581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 51940794581 in words is "fifty-one billion, nine hundred forty million, seven hundred ninety-four thousand, five hundred eighty-one".