51657772943677 has 2 divisors, whose sum is σ = 51657772943678. Its totient is φ = 51657772943676.

The previous prime is 51657772943627. The next prime is 51657772943681. The reversal of 51657772943677 is 77634927775615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43633079425156 + 8024693518521 = 6605534^2 + 2832789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51657772943677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51657772943627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25828886471838 + 25828886471839.

It is an arithmetic number, because the mean of its divisors is an integer number (25828886471839).

Almost surely, 2^{51657772943677} is an apocalyptic number.

It is an amenable number.

51657772943677 is a deficient number, since it is larger than the sum of its proper divisors (1).

51657772943677 is an equidigital number, since it uses as much as digits as its factorization.

51657772943677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3267280800, while the sum is 76.

The spelling of 51657772943677 in words is "fifty-one trillion, six hundred fifty-seven billion, seven hundred seventy-two million, nine hundred forty-three thousand, six hundred seventy-seven".