663126621366 has 64 divisors (see below), whose sum is σ = 1486390878720. Its totient is φ = 195455151360.

The previous prime is 663126621361. The next prime is 663126621373.

663126621366 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663126621361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8064090 + ... + 8145906.

It is an arithmetic number, because the mean of its divisors is an integer number (23224857480).

Almost surely, 2^663126621366 is an apocalyptic number.

663126621366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 663126621366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743195439360).

663126621366 is an abundant number, since it is smaller than the sum of its proper divisors (823264257354).

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

663126621366 is a wasteful number, since it uses less digits than its factorization.

663126621366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85189.

The product of its digits is 1679616, while the sum is 48.

The spelling of 663126621366 in words is "six hundred sixty-three billion, one hundred twenty-six million, six hundred twenty-one thousand, three hundred sixty-six".