343936661 has 16 divisors (see below), whose sum is σ = 368805888. Its totient is φ = 320166000.

The previous prime is 343936633. The next prime is 343936693. The reversal of 343936661 is 166639343.

It is a cyclic number.

It is not a de Polignac number, because 343936661 - 2¹⁸ = 343674517 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343936561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87386 + ... + 91236.

It is an arithmetic number, because the mean of its divisors is an integer number (23050368).

Almost surely, 2^343936661 is an apocalyptic number.

343936661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

343936661 is a deficient number, since it is larger than the sum of its proper divisors (24869227).

343936661 is a wasteful number, since it uses less digits than its factorization.

343936661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992.

The product of its digits is 209952, while the sum is 41.

The square root of 343936661 is about 18545.5294073801. The cubic root of 343936661 is about 700.6366052265.

The spelling of 343936661 in words is "three hundred forty-three million, nine hundred thirty-six thousand, six hundred sixty-one".