336666661 has 4 divisors (see below), whose sum is σ = 337192524. Its totient is φ = 336140800.

The previous prime is 336666647. The next prime is 336666721. The reversal of 336666661 is 166666633.

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

It can be written as a sum of positive squares in 2 ways, for example, as 190716100 + 145950561 = 13810^2 + 12081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-336666661 is a prime.

It is a super-2 number, since 2×336666661² = 226688881257777842, which 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 (336666611) 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, 261970 + ... + 263251.

It is an arithmetic number, because the mean of its divisors is an integer number (84298131).

Almost surely, 2^336666661 is an apocalyptic number.

It is an amenable number.

336666661 is a deficient number, since it is larger than the sum of its proper divisors (525863).

336666661 is an equidigital number, since it uses as much as digits as its factorization.

336666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525862.

The product of its digits is 419904, while the sum is 43.

The square root of 336666661 is about 18348.4784382793. The cubic root of 336666661 is about 695.6648131981.

The spelling of 336666661 in words is "three hundred thirty-six million, six hundred sixty-six thousand, six hundred sixty-one".