3366641561 has 4 divisors (see below), whose sum is σ = 3372558900. Its totient is φ = 3360724224.

The previous prime is 3366641549. The next prime is 3366641573. The reversal of 3366641561 is 1651466633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1651466633 = 30971 ⋅53323.

It is an interprime number because it is at equal distance from previous prime (3366641549) and next prime (3366641573).

It can be written as a sum of positive squares in 2 ways, for example, as 1105163536 + 2261478025 = 33244^2 + 47555^2 .

It is a cyclic number.

It is not a de Polignac number, because 3366641561 - 2⁶ = 3366641497 is a prime.

It is a super-2 number, since 2×3366641561² = 22668550800505033442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3366641501) 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, 2957816 + ... + 2958953.

It is an arithmetic number, because the mean of its divisors is an integer number (843139725).

Almost surely, 2^3366641561 is an apocalyptic number.

It is an amenable number.

3366641561 is a deficient number, since it is larger than the sum of its proper divisors (5917339).

3366641561 is an equidigital number, since it uses as much as digits as its factorization.

3366641561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917338.

The product of its digits is 233280, while the sum is 41.

The square root of 3366641561 is about 58022.7676089309. The cubic root of 3366641561 is about 1498.7606890951.

The spelling of 3366641561 in words is "three billion, three hundred sixty-six million, six hundred forty-one thousand, five hundred sixty-one".