166630625 has 30 divisors (see below), whose sum is σ = 242261514. Its totient is φ = 114240000.

The previous prime is 166630621. The next prime is 166630637. The reversal of 166630625 is 526036661.

It can be written as a sum of positive squares in 5 ways, for example, as 46771921 + 119858704 = 6839^2 + 10948^2 .

It is not a de Polignac number, because 166630625 - 2² = 166630621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166630621) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 27905 + ... + 33345.

Almost surely, 2^166630625 is an apocalyptic number.

It is an amenable number.

166630625 is a deficient number, since it is larger than the sum of its proper divisors (75630889).

166630625 is an frugal number, since it uses more digits than its factorization.

166630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475 (or 5453 counting only the distinct ones).

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

The square root of 166630625 is about 12908.5485241370. The cubic root of 166630625 is about 550.2815363022.

It can be divided in two parts, 16 and 6630625, that multiplied together give a square (106090000 = 10300²).

The spelling of 166630625 in words is "one hundred sixty-six million, six hundred thirty thousand, six hundred twenty-five".