155691625 has 16 divisors (see below), whose sum is σ = 195257088. Its totient is φ = 123942000.

The previous prime is 155691617. The next prime is 155691631. The reversal of 155691625 is 526196551.

155691625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155691625 - 2³ = 155691617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23424 + ... + 29326.

It is an arithmetic number, because the mean of its divisors is an integer number (12203568).

Almost surely, 2^155691625 is an apocalyptic number.

It is an amenable number.

155691625 is a deficient number, since it is larger than the sum of its proper divisors (39565463).

155691625 is an equidigital number, since it uses as much as digits as its factorization.

155691625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129 (or 6119 counting only the distinct ones).

The product of its digits is 81000, while the sum is 40.

The square root of 155691625 is about 12477.6450101772. The cubic root of 155691625 is about 537.9663160736.

The spelling of 155691625 in words is "one hundred fifty-five million, six hundred ninety-one thousand, six hundred twenty-five".