815155425 has 108 divisors (see below), whose sum is σ = 1716760656. Its totient is φ = 368625600.

The previous prime is 815155391. The next prime is 815155463. The reversal of 815155425 is 524551518.

815155425 is a `hidden beast` number, since 81 + 5 + 1 + 554 + 25 = 666.

It is not a de Polignac number, because 815155425 - 2¹¹ = 815153377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815155425.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1179330 + ... + 1180020.

It is an arithmetic number, because the mean of its divisors is an integer number (15895932).

Almost surely, 2^815155425 is an apocalyptic number.

It is an amenable number.

815155425 is an abundant number, since it is smaller than the sum of its proper divisors (901605231).

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

815155425 is a wasteful number, since it uses less digits than its factorization.

815155425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 813 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

The square root of 815155425 is about 28550.9268676167. The cubic root of 815155425 is about 934.1432379702.

The spelling of 815155425 in words is "eight hundred fifteen million, one hundred fifty-five thousand, four hundred twenty-five".