166640925 has 48 divisors (see below), whose sum is σ = 316408320. Its totient is φ = 76536000.

The previous prime is 166640923. The next prime is 166640939. The reversal of 166640925 is 529046661.

It is not a de Polignac number, because 166640925 - 2¹ = 166640923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10360 + ... + 20990.

It is an arithmetic number, because the mean of its divisors is an integer number (6591840).

Almost surely, 2^166640925 is an apocalyptic number.

166640925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166640925 is a deficient number, since it is larger than the sum of its proper divisors (149767395).

166640925 is a wasteful number, since it uses less digits than its factorization.

166640925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10674 (or 10669 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 166640925 is about 12908.9474783965. The cubic root of 166640925 is about 550.2928743201.

The spelling of 166640925 in words is "one hundred sixty-six million, six hundred forty thousand, nine hundred twenty-five".