3318166681 has 4 divisors (see below), whose sum is σ = 3395333392. Its totient is φ = 3240999972.

The previous prime is 3318166673. The next prime is 3318166699. The reversal of 3318166681 is 1866618133.

3318166681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1866618133 = 109 ⋅17124937.

It is a cyclic number.

It is not a de Polignac number, because 3318166681 - 2³ = 3318166673 is a prime.

It is a super-2 number, since 2×3318166681² = 22020460245797111522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 77166667 = 3318166681 / (3 + 3 + 1 + 8 + 1 + 6 + 6 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3318166661) 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, 38583291 + ... + 38583376.

It is an arithmetic number, because the mean of its divisors is an integer number (848833348).

Almost surely, 2^3318166681 is an apocalyptic number.

It is an amenable number.

3318166681 is a deficient number, since it is larger than the sum of its proper divisors (77166711).

3318166681 is an equidigital number, since it uses as much as digits as its factorization.

3318166681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77166710.

The product of its digits is 124416, while the sum is 43.

The square root of 3318166681 is about 57603.5301088397. The cubic root of 3318166681 is about 1491.5325403962.

The spelling of 3318166681 in words is "three billion, three hundred eighteen million, one hundred sixty-six thousand, six hundred eighty-one".