666326621796 has 48 divisors (see below), whose sum is σ = 1696152467520. Its totient is φ = 201911403520.

The previous prime is 666326621791. The next prime is 666326621803. The reversal of 666326621796 is 697126623666.

It is not an unprimeable number, because it can be changed into a prime (666326621791) 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, 7969360 + ... + 8052536.

It is an arithmetic number, because the mean of its divisors is an integer number (35336509740).

Almost surely, 2^666326621796 is an apocalyptic number.

666326621796 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

666326621796 is an abundant number, since it is smaller than the sum of its proper divisors (1029825845724).

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

666326621796 is a wasteful number, since it uses less digits than its factorization.

666326621796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143884 (or 143882 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 60.

The spelling of 666326621796 in words is "six hundred sixty-six billion, three hundred twenty-six million, six hundred twenty-one thousand, seven hundred ninety-six".