155691330 has 16 divisors (see below), whose sum is σ = 373659264. Its totient is φ = 41517680.

The previous prime is 155691311. The next prime is 155691359. The reversal of 155691330 is 33196551.

It is a junction number, because it is equal to n+sod(n) for n = 155691291 and 155691300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2594826 + ... + 2594885.

It is an arithmetic number, because the mean of its divisors is an integer number (23353704).

Almost surely, 2^155691330 is an apocalyptic number.

155691330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155691330 is an abundant number, since it is smaller than the sum of its proper divisors (217967934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155691330 is a wasteful number, since it uses less digits than its factorization.

155691330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189721.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 155691330 is about 12477.6331890307. The cubic root of 155691330 is about 537.9659762990.

The spelling of 155691330 in words is "one hundred fifty-five million, six hundred ninety-one thousand, three hundred thirty".