166681150425 has 54 divisors (see below), whose sum is σ = 299168885262. Its totient is φ = 88711025280.

The previous prime is 166681150403. The next prime is 166681150429. The reversal of 166681150425 is 524051186661.

It can be written as a sum of positive squares in 3 ways, for example, as 29037182409 + 137643968016 = 170403^2 + 371004^2 .

It is not a de Polignac number, because 166681150425 - 2⁷ = 166681150297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (166681150429) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 116315509 + ... + 116316941.

Almost surely, 2^166681150425 is an apocalyptic number.

166681150425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166681150425 is a deficient number, since it is larger than the sum of its proper divisors (132487734837).

166681150425 is an equidigital number, since it uses as much as digits as its factorization.

166681150425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 166681150425 in words is "one hundred sixty-six billion, six hundred eighty-one million, one hundred fifty thousand, four hundred twenty-five".