326981661666 has 64 divisors (see below), whose sum is σ = 715277606400. Its totient is φ = 98826877440.

The previous prime is 326981661661. The next prime is 326981661673. The reversal of 326981661666 is 666166189623.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (326981661661) 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, 72451026 + ... + 72455538.

It is an arithmetic number, because the mean of its divisors is an integer number (11176212600).

Almost surely, 2^326981661666 is an apocalyptic number.

326981661666 is an abundant number, since it is smaller than the sum of its proper divisors (388295944734).

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

326981661666 is a wasteful number, since it uses less digits than its factorization.

326981661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7151.

The product of its digits is 20155392, while the sum is 60.

The spelling of 326981661666 in words is "three hundred twenty-six billion, nine hundred eighty-one million, six hundred sixty-one thousand, six hundred sixty-six".