155405615416657 has 2 divisors, whose sum is σ = 155405615416658. Its totient is φ = 155405615416656.

The previous prime is 155405615416607. The next prime is 155405615416679. The reversal of 155405615416657 is 756614516504551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104380366322241 + 51025249094416 = 10216671^2 + 7143196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155405615416657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155405615416595 and 155405615416604.

It is not a weakly prime, because it can be changed into another prime (155405615416607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77702807708328 + 77702807708329.

It is an arithmetic number, because the mean of its divisors is an integer number (77702807708329).

Almost surely, 2^{155405615416657} is an apocalyptic number.

It is an amenable number.

155405615416657 is a deficient number, since it is larger than the sum of its proper divisors (1).

155405615416657 is an equidigital number, since it uses as much as digits as its factorization.

155405615416657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600000, while the sum is 61.

The spelling of 155405615416657 in words is "one hundred fifty-five trillion, four hundred five billion, six hundred fifteen million, four hundred sixteen thousand, six hundred fifty-seven".