155665425 has 12 divisors (see below), whose sum is σ = 257366960. Its totient is φ = 83021520.

The previous prime is 155665387. The next prime is 155665429. The reversal of 155665425 is 524566551.

It is a happy number.

It is not a de Polignac number, because 155665425 - 2¹⁵ = 155632657 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (155665429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1037695 + ... + 1037844.

Almost surely, 2^155665425 is an apocalyptic number.

155665425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155665425 is a deficient number, since it is larger than the sum of its proper divisors (101701535).

155665425 is a wasteful number, since it uses less digits than its factorization.

155665425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075552 (or 2075547 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The square root of 155665425 is about 12476.5950884045. The cubic root of 155665425 is about 537.9361378111.

The spelling of 155665425 in words is "one hundred fifty-five million, six hundred sixty-five thousand, four hundred twenty-five".