663444444366 has 32 divisors (see below), whose sum is σ = 1608350169600. Its totient is φ = 201043770840.

The previous prime is 663444444361. The next prime is 663444444389.

663444444366 is a `hidden beast` number, since 6 + 63 + 44 + 44 + 443 + 66 = 666.

663444444366 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×663444444366² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663444444361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558454326 + ... + 558455513.

It is an arithmetic number, because the mean of its divisors is an integer number (50260942800).

Almost surely, 2^663444444366 is an apocalyptic number.

663444444366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

663444444366 is an abundant number, since it is smaller than the sum of its proper divisors (944905725234).

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

663444444366 is a wasteful number, since it uses less digits than its factorization.

663444444366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116909861 (or 1116909855 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 54.

The spelling of 663444444366 in words is "six hundred sixty-three billion, four hundred forty-four million, four hundred forty-four thousand, three hundred sixty-six".