155685157 has 2 divisors, whose sum is σ = 155685158. Its totient is φ = 155685156.

The previous prime is 155685151. The next prime is 155685161. The reversal of 155685157 is 751586551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149059681 + 6625476 = 12209^2 + 2574^2 .

It is a cyclic number.

It is not a de Polignac number, because 155685157 - 2⁷ = 155685029 is a prime.

It is a super-2 number, since 2×155685157² = 48475736220229298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155685151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77842578 + 77842579.

It is an arithmetic number, because the mean of its divisors is an integer number (77842579).

Almost surely, 2^155685157 is an apocalyptic number.

It is an amenable number.

155685157 is a deficient number, since it is larger than the sum of its proper divisors (1).

155685157 is an equidigital number, since it uses as much as digits as its factorization.

155685157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210000, while the sum is 43.

The square root of 155685157 is about 12477.3858239617. The cubic root of 155685157 is about 537.9588662737.

The spelling of 155685157 in words is "one hundred fifty-five million, six hundred eighty-five thousand, one hundred fifty-seven".