155661384 has 32 divisors (see below), whose sum is σ = 412045920. Its totient is φ = 48834816.

The previous prime is 155661377. The next prime is 155661403. The reversal of 155661384 is 483166551.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190354 + ... + 191169.

It is an arithmetic number, because the mean of its divisors is an integer number (12876435).

Almost surely, 2^155661384 is an apocalyptic number.

It is an amenable number.

155661384 is an abundant number, since it is smaller than the sum of its proper divisors (256384536).

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

155661384 is a wasteful number, since it uses less digits than its factorization.

155661384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381549 (or 381545 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 155661384 is about 12476.4331441322. The cubic root of 155661384 is about 537.9314829158.

The spelling of 155661384 in words is "one hundred fifty-five million, six hundred sixty-one thousand, three hundred eighty-four".