166663025 has 12 divisors (see below), whose sum is σ = 207124764. Its totient is φ = 133032000.

The previous prime is 166663009. The next prime is 166663033. The reversal of 166663025 is 520366661.

It can be written as a sum of positive squares in 6 ways, for example, as 40347904 + 126315121 = 6352^2 + 11239^2 .

It is not a de Polignac number, because 166663025 - 2⁴ = 166663009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4295 + ... + 18755.

It is an arithmetic number, because the mean of its divisors is an integer number (17260397).

Almost surely, 2^166663025 is an apocalyptic number.

It is an amenable number.

166663025 is a deficient number, since it is larger than the sum of its proper divisors (40461739).

166663025 is a wasteful number, since it uses less digits than its factorization.

166663025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14932 (or 14927 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 166663025 is about 12909.8034454441. The cubic root of 166663025 is about 550.3171999471.

It can be divided in two parts, 16666 and 3025, that added together give a palindrome (19691).

The spelling of 166663025 in words is "one hundred sixty-six million, six hundred sixty-three thousand, twenty-five".