55857288709 has 2 divisors, whose sum is σ = 55857288710. Its totient is φ = 55857288708.

The previous prime is 55857288701. The next prime is 55857288769. The reversal of 55857288709 is 90788275855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55176600609 + 680688100 = 234897^2 + 26090^2 .

It is a cyclic number.

It is not a de Polignac number, because 55857288709 - 2³ = 55857288701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55857288701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27928644354 + 27928644355.

It is an arithmetic number, because the mean of its divisors is an integer number (27928644355).

Almost surely, 2^55857288709 is an apocalyptic number.

It is an amenable number.

55857288709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55857288709 is an equidigital number, since it uses as much as digits as its factorization.

55857288709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448000, while the sum is 64.

The spelling of 55857288709 in words is "fifty-five billion, eight hundred fifty-seven million, two hundred eighty-eight thousand, seven hundred nine".