166326000781 has 8 divisors (see below), whose sum is σ = 169155007200. Its totient is φ = 163497325200.

The previous prime is 166326000769. The next prime is 166326000793. The reversal of 166326000781 is 187000623661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166326000769) and next prime (166326000793).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166326000781 - 2⁷ = 166326000653 is a prime.

It is a super-2 number, since 2×166326000781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166326000881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065730 + ... + 1211788.

It is an arithmetic number, because the mean of its divisors is an integer number (21144375900).

Almost surely, 2^166326000781 is an apocalyptic number.

166326000781 is the 182388-th centered decagonal number.

It is an amenable number.

166326000781 is a deficient number, since it is larger than the sum of its proper divisors (2829006419).

166326000781 is a wasteful number, since it uses less digits than its factorization.

166326000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165419.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 166326000781 in words is "one hundred sixty-six billion, three hundred twenty-six million, seven hundred eighty-one", and thus it is an aban number.