155516857 has 2 divisors, whose sum is σ = 155516858. Its totient is φ = 155516856.

The previous prime is 155516827. The next prime is 155516887. The reversal of 155516857 is 758615551.

It is a balanced prime because it is at equal distance from previous prime (155516827) and next prime (155516887).

It can be written as a sum of positive squares in only one way, i.e., 145347136 + 10169721 = 12056^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 155516857 - 2¹⁵ = 155484089 is a prime.

It is a super-2 number, since 2×155516857² = 48370985622316898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155516807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77758428 + 77758429.

It is an arithmetic number, because the mean of its divisors is an integer number (77758429).

Almost surely, 2^155516857 is an apocalyptic number.

It is an amenable number.

155516857 is a deficient number, since it is larger than the sum of its proper divisors (1).

155516857 is an equidigital number, since it uses as much as digits as its factorization.

155516857 is an odious number, because the sum of its binary digits is odd.

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

The square root of 155516857 is about 12470.6397991442. The cubic root of 155516857 is about 537.7649468631.

The spelling of 155516857 in words is "one hundred fifty-five million, five hundred sixteen thousand, eight hundred fifty-seven".