155580985 has 24 divisors (see below), whose sum is σ = 215974080. Its totient is φ = 105396192.

The previous prime is 155580979. The next prime is 155581007. The reversal of 155580985 is 589085551.

It is a happy number.

It is not a de Polignac number, because 155580985 - 2⁹ = 155580473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371106 + ... + 371524.

It is an arithmetic number, because the mean of its divisors is an integer number (8998920).

Almost surely, 2^155580985 is an apocalyptic number.

It is an amenable number.

155580985 is a deficient number, since it is larger than the sum of its proper divisors (60393095).

155580985 is an equidigital number, since it uses as much as digits as its factorization.

155580985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 46.

The square root of 155580985 is about 12473.2106933219. The cubic root of 155580985 is about 537.8388532167.

The spelling of 155580985 in words is "one hundred fifty-five million, five hundred eighty thousand, nine hundred eighty-five".