166465642643 has 2 divisors, whose sum is σ = 166465642644. Its totient is φ = 166465642642.

The previous prime is 166465642639. The next prime is 166465642669. The reversal of 166465642643 is 346246564661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166465642643 - 2² = 166465642639 is a prime.

It is not a weakly prime, because it can be changed into another prime (166465642613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83232821321 + 83232821322.

It is an arithmetic number, because the mean of its divisors is an integer number (83232821322).

Almost surely, 2^166465642643 is an apocalyptic number.

166465642643 is a deficient number, since it is larger than the sum of its proper divisors (1).

166465642643 is an equidigital number, since it uses as much as digits as its factorization.

166465642643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 53.

The spelling of 166465642643 in words is "one hundred sixty-six billion, four hundred sixty-five million, six hundred forty-two thousand, six hundred forty-three".