155662117249 has 2 divisors, whose sum is σ = 155662117250. Its totient is φ = 155662117248.

The previous prime is 155662117201. The next prime is 155662117279. The reversal of 155662117249 is 942711266551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93645180225 + 62016937024 = 306015^2 + 249032^2 .

It is a cyclic number.

It is not a de Polignac number, because 155662117249 - 2³³ = 147072182657 is a prime.

It is not a weakly prime, because it can be changed into another prime (155662117279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77831058624 + 77831058625.

It is an arithmetic number, because the mean of its divisors is an integer number (77831058625).

Almost surely, 2^155662117249 is an apocalyptic number.

It is an amenable number.

155662117249 is a deficient number, since it is larger than the sum of its proper divisors (1).

155662117249 is an equidigital number, since it uses as much as digits as its factorization.

155662117249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 155662117249 in words is "one hundred fifty-five billion, six hundred sixty-two million, one hundred seventeen thousand, two hundred forty-nine".