155161665 has 24 divisors (see below), whose sum is σ = 277625088. Its totient is φ = 80082720.

The previous prime is 155161661. The next prime is 155161667. The reversal of 155161665 is 566161551.

It is not a de Polignac number, because 155161665 - 2² = 155161661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155161661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54219 + ... + 57008.

It is an arithmetic number, because the mean of its divisors is an integer number (11567712).

Almost surely, 2^155161665 is an apocalyptic number.

155161665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155161665 is a deficient number, since it is larger than the sum of its proper divisors (122463423).

155161665 is a wasteful number, since it uses less digits than its factorization.

155161665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111269 (or 111266 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 155161665 is about 12456.3905285600. The cubic root of 155161665 is about 537.3552261976.

The spelling of 155161665 in words is "one hundred fifty-five million, one hundred sixty-one thousand, six hundred sixty-five".