394702643663 has 2 divisors, whose sum is σ = 394702643664. Its totient is φ = 394702643662.

The previous prime is 394702643659. The next prime is 394702643677. The reversal of 394702643663 is 366346207493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394702643663 - 2² = 394702643659 is a prime.

It is a super-2 number, since 2×394702643663² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394702643963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197351321831 + 197351321832.

It is an arithmetic number, because the mean of its divisors is an integer number (197351321832).

Almost surely, 2^394702643663 is an apocalyptic number.

394702643663 is a deficient number, since it is larger than the sum of its proper divisors (1).

394702643663 is an equidigital number, since it uses as much as digits as its factorization.

394702643663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11757312, while the sum is 53.

The spelling of 394702643663 in words is "three hundred ninety-four billion, seven hundred two million, six hundred forty-three thousand, six hundred sixty-three".