166425631 has 8 divisors (see below), whose sum is σ = 183877344. Its totient is φ = 149825280.

The previous prime is 166425583. The next prime is 166425641. The reversal of 166425631 is 136524661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166425631 is a prime.

It is a super-2 number, since 2×166425631² = 55394981307496322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166425641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212430 + ... + 213211.

It is an arithmetic number, because the mean of its divisors is an integer number (22984668).

Almost surely, 2^166425631 is an apocalyptic number.

166425631 is a deficient number, since it is larger than the sum of its proper divisors (17451713).

166425631 is a wasteful number, since it uses less digits than its factorization.

166425631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425681.

The product of its digits is 25920, while the sum is 34.

The square root of 166425631 is about 12900.6058384868. The cubic root of 166425631 is about 550.0557860770.

The spelling of 166425631 in words is "one hundred sixty-six million, four hundred twenty-five thousand, six hundred thirty-one".