55660211657 has 2 divisors, whose sum is σ = 55660211658. Its totient is φ = 55660211656.

The previous prime is 55660211611. The next prime is 55660211671. The reversal of 55660211657 is 75611206655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33715937161 + 21944274496 = 183619^2 + 148136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55660211657 is a prime.

It is not a weakly prime, because it can be changed into another prime (55660211857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27830105828 + 27830105829.

It is an arithmetic number, because the mean of its divisors is an integer number (27830105829).

Almost surely, 2^55660211657 is an apocalyptic number.

It is an amenable number.

55660211657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55660211657 is an equidigital number, since it uses as much as digits as its factorization.

55660211657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 55660211657 in words is "fifty-five billion, six hundred sixty million, two hundred eleven thousand, six hundred fifty-seven".