168432557 has 2 divisors, whose sum is σ = 168432558. Its totient is φ = 168432556.

The previous prime is 168432541. The next prime is 168432559. The reversal of 168432557 is 755234861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153908836 + 14523721 = 12406^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 168432557 - 2⁴ = 168432541 is a prime.

Together with 168432559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168432559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84216278 + 84216279.

It is an arithmetic number, because the mean of its divisors is an integer number (84216279).

Almost surely, 2^168432557 is an apocalyptic number.

It is an amenable number.

168432557 is a deficient number, since it is larger than the sum of its proper divisors (1).

168432557 is an equidigital number, since it uses as much as digits as its factorization.

168432557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 168432557 is about 12978.1569184534. The cubic root of 168432557 is about 552.2579976577.

The spelling of 168432557 in words is "one hundred sixty-eight million, four hundred thirty-two thousand, five hundred fifty-seven".