161866427 has 2 divisors, whose sum is σ = 161866428. Its totient is φ = 161866426.

The previous prime is 161866421. The next prime is 161866447. The reversal of 161866427 is 724668161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161866427 - 2⁶ = 161866363 is a prime.

It is not a weakly prime, because it can be changed into another prime (161866421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80933213 + 80933214.

It is an arithmetic number, because the mean of its divisors is an integer number (80933214).

Almost surely, 2^161866427 is an apocalyptic number.

161866427 is a deficient number, since it is larger than the sum of its proper divisors (1).

161866427 is an equidigital number, since it uses as much as digits as its factorization.

161866427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 161866427 is about 12722.6737362867. The cubic root of 161866427 is about 544.9863105727.

The spelling of 161866427 in words is "one hundred sixty-one million, eight hundred sixty-six thousand, four hundred twenty-seven".