56551767757 has 2 divisors, whose sum is σ = 56551767758. Its totient is φ = 56551767756.

The previous prime is 56551767749. The next prime is 56551767781. The reversal of 56551767757 is 75776715565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56374904356 + 176863401 = 237434^2 + 13299^2 .

It is a cyclic number.

It is not a de Polignac number, because 56551767757 - 2³ = 56551767749 is a prime.

It is a super-2 number, since 2×56551767757² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56551767695 and 56551767704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56551767787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28275883878 + 28275883879.

It is an arithmetic number, because the mean of its divisors is an integer number (28275883879).

Almost surely, 2^56551767757 is an apocalyptic number.

It is an amenable number.

56551767757 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551767757 is an equidigital number, since it uses as much as digits as its factorization.

56551767757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54022500, while the sum is 61.

The spelling of 56551767757 in words is "fifty-six billion, five hundred fifty-one million, seven hundred sixty-seven thousand, seven hundred fifty-seven".