56997857779 has 2 divisors, whose sum is σ = 56997857780. Its totient is φ = 56997857778.

The previous prime is 56997857753. The next prime is 56997857801. The reversal of 56997857779 is 97775879965.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56997857779 - 2²³ = 56989469171 is a prime.

It is a super-2 number, since 2×56997857779² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56997857699 and 56997857708.

It is not a weakly prime, because it can be changed into another prime (56997827779) 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, 28498928889 + 28498928890.

It is an arithmetic number, because the mean of its divisors is an integer number (28498928890).

Almost surely, 2^56997857779 is an apocalyptic number.

56997857779 is a deficient number, since it is larger than the sum of its proper divisors (1).

56997857779 is an equidigital number, since it uses as much as digits as its factorization.

56997857779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100394800, while the sum is 79.

The spelling of 56997857779 in words is "fifty-six billion, nine hundred ninety-seven million, eight hundred fifty-seven thousand, seven hundred seventy-nine".