3845666399 has 2 divisors, whose sum is σ = 3845666400. Its totient is φ = 3845666398.

The previous prime is 3845666393. The next prime is 3845666413. The reversal of 3845666399 is 9936665483.

It is a weak prime.

It is an emirp because it is prime and its reverse (9936665483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3845666399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3845666393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1922833199 + 1922833200.

It is an arithmetic number, because the mean of its divisors is an integer number (1922833200).

Almost surely, 2^3845666399 is an apocalyptic number.

3845666399 is a deficient number, since it is larger than the sum of its proper divisors (1).

3845666399 is an equidigital number, since it uses as much as digits as its factorization.

3845666399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 59.

The square root of 3845666399 is about 62013.4372454874. The cubic root of 3845666399 is about 1566.7169279836.

The spelling of 3845666399 in words is "three billion, eight hundred forty-five million, six hundred sixty-six thousand, three hundred ninety-nine".