168191623 has 2 divisors, whose sum is σ = 168191624. Its totient is φ = 168191622.

The previous prime is 168191581. The next prime is 168191633. The reversal of 168191623 is 326191861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168191623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168191633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84095811 + 84095812.

It is an arithmetic number, because the mean of its divisors is an integer number (84095812).

Almost surely, 2^168191623 is an apocalyptic number.

168191623 is a deficient number, since it is larger than the sum of its proper divisors (1).

168191623 is an equidigital number, since it uses as much as digits as its factorization.

168191623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 168191623 is about 12968.8713078664. The cubic root of 168191623 is about 551.9945465662.

The spelling of 168191623 in words is "one hundred sixty-eight million, one hundred ninety-one thousand, six hundred twenty-three".