51940323561 has 16 divisors (see below), whose sum is σ = 79161565184. Its totient is φ = 29674782864.

The previous prime is 51940323557. The next prime is 51940323569. The reversal of 51940323561 is 16532304915.

51940323561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51940323561 - 2² = 51940323557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51940323569) 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, 105481 + ... + 339126.

It is an arithmetic number, because the mean of its divisors is an integer number (4947597824).

Almost surely, 2^51940323561 is an apocalyptic number.

It is an amenable number.

51940323561 is a deficient number, since it is larger than the sum of its proper divisors (27221241623).

51940323561 is a wasteful number, since it uses less digits than its factorization.

51940323561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450180.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 51940323561 in words is "fifty-one billion, nine hundred forty million, three hundred twenty-three thousand, five hundred sixty-one".