56785705129 has 2 divisors, whose sum is σ = 56785705130. Its totient is φ = 56785705128.

The previous prime is 56785705121. The next prime is 56785705211. The reversal of 56785705129 is 92150758765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46968858729 + 9816846400 = 216723^2 + 99080^2 .

It is a cyclic number.

It is not a de Polignac number, because 56785705129 - 2³ = 56785705121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56785705129.

It is not a weakly prime, because it can be changed into another prime (56785705121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28392852564 + 28392852565.

It is an arithmetic number, because the mean of its divisors is an integer number (28392852565).

Almost surely, 2^56785705129 is an apocalyptic number.

It is an amenable number.

56785705129 is a deficient number, since it is larger than the sum of its proper divisors (1).

56785705129 is an equidigital number, since it uses as much as digits as its factorization.

56785705129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292000, while the sum is 55.

The spelling of 56785705129 in words is "fifty-six billion, seven hundred eighty-five million, seven hundred five thousand, one hundred twenty-nine".