396244639665 has 256 divisors, whose sum is σ = 864725606400. Its totient is φ = 168129561600.

The previous prime is 396244639657. The next prime is 396244639669. The reversal of 396244639665 is 566936442693.

396244639665 is a `hidden beast` number, since 3 + 9 + 6 + 24 + 463 + 96 + 65 = 666.

It is not a de Polignac number, because 396244639665 - 2³ = 396244639657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (396244639669) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 362528859 + ... + 362529951.

It is an arithmetic number, because the mean of its divisors is an integer number (3377834400).

Almost surely, 2^396244639665 is an apocalyptic number.

396244639665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

396244639665 is an abundant number, since it is smaller than the sum of its proper divisors (468480966735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396244639665 is a wasteful number, since it uses less digits than its factorization.

396244639665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1519 counting only the distinct ones).

The product of its digits is 151165440, while the sum is 63.

The spelling of 396244639665 in words is "three hundred ninety-six billion, two hundred forty-four million, six hundred thirty-nine thousand, six hundred sixty-five".