343566661 has 2 divisors, whose sum is σ = 343566662. Its totient is φ = 343566660.

The previous prime is 343566649. The next prime is 343566667. The reversal of 343566661 is 166665343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205033761 + 138532900 = 14319^2 + 11770^2 .

It is a cyclic number.

It is not a de Polignac number, because 343566661 - 2⁷ = 343566533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343566667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171783330 + 171783331.

It is an arithmetic number, because the mean of its divisors is an integer number (171783331).

Almost surely, 2^343566661 is an apocalyptic number.

It is an amenable number.

343566661 is a deficient number, since it is larger than the sum of its proper divisors (1).

343566661 is an equidigital number, since it uses as much as digits as its factorization.

343566661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The square root of 343566661 is about 18535.5512731615. The cubic root of 343566661 is about 700.3852715857.

The spelling of 343566661 in words is "three hundred forty-three million, five hundred sixty-six thousand, six hundred sixty-one".