56862757781 has 2 divisors, whose sum is σ = 56862757782. Its totient is φ = 56862757780.

The previous prime is 56862757769. The next prime is 56862757807. The reversal of 56862757781 is 18775726865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41632729681 + 15230028100 = 204041^2 + 123410^2 .

It is a cyclic number.

It is not a de Polignac number, because 56862757781 - 2¹⁰ = 56862756757 is a prime.

It is a super-2 number, since 2×56862757781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56862757711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28431378890 + 28431378891.

It is an arithmetic number, because the mean of its divisors is an integer number (28431378891).

Almost surely, 2^56862757781 is an apocalyptic number.

It is an amenable number.

56862757781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56862757781 is an equidigital number, since it uses as much as digits as its factorization.

56862757781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39513600, while the sum is 62.

The spelling of 56862757781 in words is "fifty-six billion, eight hundred sixty-two million, seven hundred fifty-seven thousand, seven hundred eighty-one".