155665125 has 128 divisors (see below), whose sum is σ = 359424000. Its totient is φ = 64584000.

The previous prime is 155665123. The next prime is 155665129. The reversal of 155665125 is 521566551.

It is not a de Polignac number, because 155665125 - 2¹ = 155665123 is a prime.

It is a super-2 number, since 2×155665125² = 48463262282531250, which contains 22 as substring.

Its product of digits (45000) is a multiple of the sum of its prime divisors (625).

It is a self number, because there is not a number n which added to its sum of digits gives 155665125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155665121) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 259576 + ... + 260174.

It is an arithmetic number, because the mean of its divisors is an integer number (2808000).

Almost surely, 2^155665125 is an apocalyptic number.

155665125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155665125 is an abundant number, since it is smaller than the sum of its proper divisors (203758875).

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

155665125 is a wasteful number, since it uses less digits than its factorization.

155665125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 625 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 155665125 is about 12476.5830658879. The cubic root of 155665125 is about 537.9357922388.

The spelling of 155665125 in words is "one hundred fifty-five million, six hundred sixty-five thousand, one hundred twenty-five".