155665530 has 32 divisors (see below), whose sum is σ = 415108800. Its totient is φ = 41510736.

The previous prime is 155665519. The next prime is 155665553. The reversal of 155665530 is 35566551.

155665530 is a `hidden beast` number, since 15 + 56 + 65 + 530 = 666.

It is an unprimeable number.

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, 288000 + ... + 288539.

It is an arithmetic number, because the mean of its divisors is an integer number (12972150).

Almost surely, 2^155665530 is an apocalyptic number.

155665530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155665530 is an abundant number, since it is smaller than the sum of its proper divisors (259443270).

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

155665530 is a wasteful number, since it uses less digits than its factorization.

155665530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576555 (or 576549 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The square root of 155665530 is about 12476.5992962826. The cubic root of 155665530 is about 537.9362587612.

The spelling of 155665530 in words is "one hundred fifty-five million, six hundred sixty-five thousand, five hundred thirty".