56551767787 has 2 divisors, whose sum is σ = 56551767788. Its totient is φ = 56551767786.

The previous prime is 56551767781. The next prime is 56551767791. The reversal of 56551767787 is 78776715565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56551767787 - 2⁷ = 56551767659 is a prime.

It is not a weakly prime, because it can be changed into another prime (56551767781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28275883893 + 28275883894.

It is an arithmetic number, because the mean of its divisors is an integer number (28275883894).

Almost surely, 2^56551767787 is an apocalyptic number.

56551767787 is a deficient number, since it is larger than the sum of its proper divisors (1).

56551767787 is an equidigital number, since it uses as much as digits as its factorization.

56551767787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86436000, while the sum is 64.

The spelling of 56551767787 in words is "fifty-six billion, five hundred fifty-one million, seven hundred sixty-seven thousand, seven hundred eighty-seven".