326981661667 has 4 divisors (see below), whose sum is σ = 327018006000. Its totient is φ = 326945317336.

The previous prime is 326981661661. The next prime is 326981661673. The reversal of 326981661667 is 766166189623.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (326981661661) and next prime (326981661673).

It is a cyclic number.

It is not a de Polignac number, because 326981661667 - 2²⁷ = 326847443939 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 18158668 + ... + 18176665.

It is an arithmetic number, because the mean of its divisors is an integer number (81754501500).

Almost surely, 2^326981661667 is an apocalyptic number.

326981661667 is a deficient number, since it is larger than the sum of its proper divisors (36344333).

326981661667 is an equidigital number, since it uses as much as digits as its factorization.

326981661667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36344332.

The product of its digits is 23514624, while the sum is 61.

The spelling of 326981661667 in words is "three hundred twenty-six billion, nine hundred eighty-one million, six hundred sixty-one thousand, six hundred sixty-seven".