155601865 has 16 divisors (see below), whose sum is σ = 193130496. Its totient is φ = 120225600.

The previous prime is 155601863. The next prime is 155601883. The reversal of 155601865 is 568106551.

It is not a de Polignac number, because 155601865 - 2¹ = 155601863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155601863) 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 15 ways as a sum of consecutive naturals, for example, 153099 + ... + 154111.

It is an arithmetic number, because the mean of its divisors is an integer number (12070656).

Almost surely, 2^155601865 is an apocalyptic number.

It is an amenable number.

155601865 is a deficient number, since it is larger than the sum of its proper divisors (37528631).

155601865 is a wasteful number, since it uses less digits than its factorization.

155601865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 155601865 is about 12474.0476590399. The cubic root of 155601865 is about 537.8629126541.

The spelling of 155601865 in words is "one hundred fifty-five million, six hundred one thousand, eight hundred sixty-five".