416665643 has 2 divisors, whose sum is σ = 416665644. Its totient is φ = 416665642.

The previous prime is 416665609. The next prime is 416665651. The reversal of 416665643 is 346566614.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 416665643 - 2²⁴ = 399888427 is a prime.

It is a super-2 number, since 2×416665643² = 347220516113206898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 416665643.

It is not a weakly prime, because it can be changed into another prime (416665663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208332821 + 208332822.

It is an arithmetic number, because the mean of its divisors is an integer number (208332822).

Almost surely, 2^416665643 is an apocalyptic number.

416665643 is a deficient number, since it is larger than the sum of its proper divisors (1).

416665643 is an equidigital number, since it uses as much as digits as its factorization.

416665643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 41.

The square root of 416665643 is about 20412.3894485677. The cubic root of 416665643 is about 746.9001794304.

The spelling of 416665643 in words is "four hundred sixteen million, six hundred sixty-five thousand, six hundred forty-three".