155880865 has 16 divisors (see below), whose sum is σ = 220677120. Its totient is φ = 103440960.

The previous prime is 155880863. The next prime is 155880869. The reversal of 155880865 is 568088551.

It is not a de Polignac number, because 155880865 - 2¹ = 155880863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155880863) 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, 70750 + ... + 72919.

It is an arithmetic number, because the mean of its divisors is an integer number (13792320).

Almost surely, 2^155880865 is an apocalyptic number.

It is an amenable number.

155880865 is a deficient number, since it is larger than the sum of its proper divisors (64796255).

155880865 is a wasteful number, since it uses less digits than its factorization.

155880865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143712.

The product of its (nonzero) digits is 384000, while the sum is 46.

The square root of 155880865 is about 12485.2258690021. The cubic root of 155880865 is about 538.1841901912.

The spelling of 155880865 in words is "one hundred fifty-five million, eight hundred eighty thousand, eight hundred sixty-five".