166425431 has 2 divisors, whose sum is σ = 166425432. Its totient is φ = 166425430.

The previous prime is 166425421. The next prime is 166425433. The reversal of 166425431 is 134524661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166425431 is a prime.

It is a super-2 number, since 2×166425431² = 55394848167071522, which contains 22 as substring.

Together with 166425433, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_9314168 and since 166425431 and 9314168 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166425433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83212715 + 83212716.

It is an arithmetic number, because the mean of its divisors is an integer number (83212716).

Almost surely, 2^166425431 is an apocalyptic number.

166425431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166425431 is an equidigital number, since it uses as much as digits as its factorization.

166425431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 166425431 is about 12900.5980869105. The cubic root of 166425431 is about 550.0555657359.

The spelling of 166425431 in words is "one hundred sixty-six million, four hundred twenty-five thousand, four hundred thirty-one".