166615425 has 18 divisors (see below), whose sum is σ = 298427142. Its totient is φ = 88861440.

The previous prime is 166615391. The next prime is 166615429. The reversal of 166615425 is 524516661.

166615425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 33628401 + 132987024 = 5799^2 + 11532^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166615425 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 166615425.

It is not an unprimeable number, because it can be changed into a prime (166615429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 370032 + ... + 370481.

Almost surely, 2^166615425 is an apocalyptic number.

166615425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166615425 is a deficient number, since it is larger than the sum of its proper divisors (131811717).

166615425 is a wasteful number, since it uses less digits than its factorization.

166615425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740529 (or 740521 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 166615425 is about 12907.9597535784. The cubic root of 166615425 is about 550.2648036164.

The spelling of 166615425 in words is "one hundred sixty-six million, six hundred fifteen thousand, four hundred twenty-five".