155660099 has 32 divisors (see below), whose sum is σ = 189112320. Its totient is φ = 125379072.

The previous prime is 155660053. The next prime is 155660101. The reversal of 155660099 is 990066551.

155660099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-155660099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155660399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377467 + ... + 1377579.

It is an arithmetic number, because the mean of its divisors is an integer number (5909760).

Almost surely, 2^155660099 is an apocalyptic number.

155660099 is a deficient number, since it is larger than the sum of its proper divisors (33452221).

155660099 is a wasteful number, since it uses less digits than its factorization.

155660099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 155660099 is about 12476.3816469359. The cubic root of 155660099 is about 537.9300026860.

The spelling of 155660099 in words is "one hundred fifty-five million, six hundred sixty thousand, ninety-nine".