155668317 has 16 divisors (see below), whose sum is σ = 245389440. Its totient is φ = 85885632.

The previous prime is 155668313. The next prime is 155668319. The reversal of 155668317 is 713866551.

It is not a de Polignac number, because 155668317 - 2² = 155668313 is a prime.

It is a super-2 number, since 2×155668317² = 48465249835224978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155668313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127198 + ... + 128415.

It is an arithmetic number, because the mean of its divisors is an integer number (15336840).

Almost surely, 2^155668317 is an apocalyptic number.

It is an amenable number.

155668317 is a deficient number, since it is larger than the sum of its proper divisors (89721123).

155668317 is a wasteful number, since it uses less digits than its factorization.

155668317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255652.

The product of its digits is 151200, while the sum is 42.

The square root of 155668317 is about 12476.7109848710. The cubic root of 155668317 is about 537.9394691046.

The spelling of 155668317 in words is "one hundred fifty-five million, six hundred sixty-eight thousand, three hundred seventeen".