51173513977 has 2 divisors, whose sum is σ = 51173513978. Its totient is φ = 51173513976.

The previous prime is 51173513969. The next prime is 51173514023. The reversal of 51173513977 is 77931537115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39726867856 + 11446646121 = 199316^2 + 106989^2 .

It is a cyclic number.

It is not a de Polignac number, because 51173513977 - 2³ = 51173513969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51173513977.

It is not a weakly prime, because it can be changed into another prime (51173513177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586756988 + 25586756989.

It is an arithmetic number, because the mean of its divisors is an integer number (25586756989).

Almost surely, 2^51173513977 is an apocalyptic number.

It is an amenable number.

51173513977 is a deficient number, since it is larger than the sum of its proper divisors (1).

51173513977 is an equidigital number, since it uses as much as digits as its factorization.

51173513977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 694575, while the sum is 49.

The spelling of 51173513977 in words is "fifty-one billion, one hundred seventy-three million, five hundred thirteen thousand, nine hundred seventy-seven".