51497979773 has 4 divisors (see below), whose sum is σ = 51498946368. Its totient is φ = 51497013180.

The previous prime is 51497979749. The next prime is 51497979781. The reversal of 51497979773 is 37797979415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51497979773 - 2²⁴ = 51481202557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51497979733) 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, 398411 + ... + 511592.

It is an arithmetic number, because the mean of its divisors is an integer number (12874736592).

Almost surely, 2^51497979773 is an apocalyptic number.

It is an amenable number.

51497979773 is a deficient number, since it is larger than the sum of its proper divisors (966595).

51497979773 is an equidigital number, since it uses as much as digits as its factorization.

51497979773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966594.

The product of its digits is 105019740, while the sum is 68.

The spelling of 51497979773 in words is "fifty-one billion, four hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred seventy-three".