166187423 has 2 divisors, whose sum is σ = 166187424. Its totient is φ = 166187422.

The previous prime is 166187419. The next prime is 166187447. The reversal of 166187423 is 324781661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166187423 - 2² = 166187419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166087423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83093711 + 83093712.

It is an arithmetic number, because the mean of its divisors is an integer number (83093712).

Almost surely, 2^166187423 is an apocalyptic number.

166187423 is a deficient number, since it is larger than the sum of its proper divisors (1).

166187423 is an equidigital number, since it uses as much as digits as its factorization.

166187423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 166187423 is about 12891.3700978600. The cubic root of 166187423 is about 549.7932258536.

The spelling of 166187423 in words is "one hundred sixty-six million, one hundred eighty-seven thousand, four hundred twenty-three".