51791465659 has 4 divisors (see below), whose sum is σ = 52059815416. Its totient is φ = 51523115904.

The previous prime is 51791465641. The next prime is 51791465669. The reversal of 51791465659 is 95656419715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51791465659 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 134174589 + ... + 134174974.

It is an arithmetic number, because the mean of its divisors is an integer number (13014953854).

Almost surely, 2^51791465659 is an apocalyptic number.

51791465659 is a deficient number, since it is larger than the sum of its proper divisors (268349757).

51791465659 is a wasteful number, since it uses less digits than its factorization.

51791465659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268349756.

The product of its digits is 10206000, while the sum is 58.

The spelling of 51791465659 in words is "fifty-one billion, seven hundred ninety-one million, four hundred sixty-five thousand, six hundred fifty-nine".