344155661 has 2 divisors, whose sum is σ = 344155662. Its totient is φ = 344155660.

The previous prime is 344155631. The next prime is 344155663. The reversal of 344155661 is 166551443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227104900 + 117050761 = 15070^2 + 10819^2 .

It is a cyclic number.

It is not a de Polignac number, because 344155661 - 2⁶ = 344155597 is a prime.

It is a super-3 number, since 3×344155661³ (a number of 27 digits) contains 333 as substring.

Together with 344155663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344155663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172077830 + 172077831.

It is an arithmetic number, because the mean of its divisors is an integer number (172077831).

Almost surely, 2^344155661 is an apocalyptic number.

It is an amenable number.

344155661 is a deficient number, since it is larger than the sum of its proper divisors (1).

344155661 is an equidigital number, since it uses as much as digits as its factorization.

344155661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 344155661 is about 18551.4328557123. The cubic root of 344155661 is about 700.7852826606.

The spelling of 344155661 in words is "three hundred forty-four million, one hundred fifty-five thousand, six hundred sixty-one".