3345021661 has 4 divisors (see below), whose sum is σ = 3346428924. Its totient is φ = 3343614400.

The previous prime is 3345021653. The next prime is 3345021671. The reversal of 3345021661 is 1661205433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1661205433 = 383 ⋅4337351.

It can be written as a sum of positive squares in 2 ways, for example, as 1565784900 + 1779236761 = 39570^2 + 42181^2 .

It is a cyclic number.

It is not a de Polignac number, because 3345021661 - 2³ = 3345021653 is a prime.

It is a super-2 number, since 2×3345021661² = 22378339825118397842, 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 (3345021671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700060 + ... + 704821.

It is an arithmetic number, because the mean of its divisors is an integer number (836607231).

Almost surely, 2^3345021661 is an apocalyptic number.

It is an amenable number.

3345021661 is a deficient number, since it is larger than the sum of its proper divisors (1407263).

3345021661 is a wasteful number, since it uses less digits than its factorization.

3345021661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407262.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3345021661 is about 57836.1622257217. The cubic root of 3345021661 is about 1495.5455496012.

The spelling of 3345021661 in words is "three billion, three hundred forty-five million, twenty-one thousand, six hundred sixty-one".