56620216789 has 2 divisors, whose sum is σ = 56620216790. Its totient is φ = 56620216788.

The previous prime is 56620216729. The next prime is 56620216799. The reversal of 56620216789 is 98761202665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51362516689 + 5257700100 = 226633^2 + 72510^2 .

It is a cyclic number.

It is not a de Polignac number, because 56620216789 - 2¹³ = 56620208597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56620216729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28310108394 + 28310108395.

It is an arithmetic number, because the mean of its divisors is an integer number (28310108395).

Almost surely, 2^56620216789 is an apocalyptic number.

It is an amenable number.

56620216789 is a deficient number, since it is larger than the sum of its proper divisors (1).

56620216789 is an equidigital number, since it uses as much as digits as its factorization.

56620216789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 56620216789 in words is "fifty-six billion, six hundred twenty million, two hundred sixteen thousand, seven hundred eighty-nine".