51791465661 has 16 divisors (see below), whose sum is σ = 76931621760. Its totient is φ = 30772647360.

The previous prime is 51791465641. The next prime is 51791465669. The reversal of 51791465661 is 16656419715.

It is not a de Polignac number, because 51791465661 - 2⁶ = 51791465597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51791465669) 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, 22895185 + ... + 22897446.

It is an arithmetic number, because the mean of its divisors is an integer number (4808226360).

Almost surely, 2^51791465661 is an apocalyptic number.

It is an amenable number.

51791465661 is a deficient number, since it is larger than the sum of its proper divisors (25140156099).

51791465661 is a wasteful number, since it uses less digits than its factorization.

51791465661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45792676.

The product of its digits is 1360800, while the sum is 51.

The spelling of 51791465661 in words is "fifty-one billion, seven hundred ninety-one million, four hundred sixty-five thousand, six hundred sixty-one".