393665566393 has 12 divisors (see below), whose sum is σ = 451520121024. Its totient is φ = 342317881400.

The previous prime is 393665566331. The next prime is 393665566417.

It is a happy number.

393665566393 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 393665566393 - 2³⁷ = 256226612921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393665566993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70724053 + ... + 70729618.

It is an arithmetic number, because the mean of its divisors is an integer number (37626676752).

Almost surely, 2^393665566393 is an apocalyptic number.

It is an amenable number.

393665566393 is a deficient number, since it is larger than the sum of its proper divisors (57854554631).

393665566393 is a wasteful number, since it uses less digits than its factorization.

393665566393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141453716 (or 141453705 counting only the distinct ones).

The product of its digits is 212576400, while the sum is 64.

The spelling of 393665566393 in words is "three hundred ninety-three billion, six hundred sixty-five million, five hundred sixty-six thousand, three hundred ninety-three".