155920685 has 16 divisors (see below), whose sum is σ = 199940400. Its totient is φ = 116315136.

The previous prime is 155920673. The next prime is 155920691. The reversal of 155920685 is 586029551.

It can be written as a sum of positive squares in 8 ways, for example, as 3200521 + 152720164 = 1789^2 + 12358^2 .

It is a cyclic number.

It is not a de Polignac number, because 155920685 - 2¹⁰ = 155919661 is a prime.

It is a super-2 number, since 2×155920685² = 48622520021738450, which contains 22 as substring.

It is a congruent number.

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, 851 + ... + 17679.

It is an arithmetic number, because the mean of its divisors is an integer number (12496275).

Almost surely, 2^155920685 is an apocalyptic number.

It is an amenable number.

155920685 is a deficient number, since it is larger than the sum of its proper divisors (44019715).

155920685 is a wasteful number, since it uses less digits than its factorization.

155920685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16960.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 155920685 is about 12486.8204519806. The cubic root of 155920685 is about 538.2300129416.

The spelling of 155920685 in words is "one hundred fifty-five million, nine hundred twenty thousand, six hundred eighty-five".