155515425 has 24 divisors (see below), whose sum is σ = 276898944. Its totient is φ = 76560960.

The previous prime is 155515421. The next prime is 155515427. The reversal of 155515425 is 524515551.

It is not a de Polignac number, because 155515425 - 2² = 155515421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155515421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78777 + ... + 80726.

It is an arithmetic number, because the mean of its divisors is an integer number (11537456).

Almost surely, 2^155515425 is an apocalyptic number.

155515425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155515425 is a deficient number, since it is larger than the sum of its proper divisors (121383519).

155515425 is a wasteful number, since it uses less digits than its factorization.

155515425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159529 (or 159524 counting only the distinct ones).

The product of its digits is 25000, while the sum is 33.

The square root of 155515425 is about 12470.5823841551. The cubic root of 155515425 is about 537.7632962773.

The spelling of 155515425 in words is "one hundred fifty-five million, five hundred fifteen thousand, four hundred twenty-five".