343856665 has 4 divisors (see below), whose sum is σ = 412628004. Its totient is φ = 275085328.

The previous prime is 343856657. The next prime is 343856719. The reversal of 343856665 is 566658343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566658343 = 43 ⋅13178101.

It can be written as a sum of positive squares in 2 ways, for example, as 191185929 + 152670736 = 13827^2 + 12356^2 .

It is a cyclic number.

It is not a de Polignac number, because 343856665 - 2³ = 343856657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34385662 + ... + 34385671.

It is an arithmetic number, because the mean of its divisors is an integer number (103157001).

Almost surely, 2^343856665 is an apocalyptic number.

It is an amenable number.

343856665 is a deficient number, since it is larger than the sum of its proper divisors (68771339).

343856665 is an equidigital number, since it uses as much as digits as its factorization.

343856665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68771338.

The product of its digits is 1555200, while the sum is 46.

The square root of 343856665 is about 18543.3725357606. The cubic root of 343856665 is about 700.5822808133.

The spelling of 343856665 in words is "three hundred forty-three million, eight hundred fifty-six thousand, six hundred sixty-five".