340644661 has 4 divisors (see below), whose sum is σ = 389308192. Its totient is φ = 291981132.

The previous prime is 340644649. The next prime is 340644677. The reversal of 340644661 is 166446043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166446043 = 103 ⋅1615981.

It is a cyclic number.

It is not a de Polignac number, because 340644661 - 2¹⁹ = 340120373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340644961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24331755 + ... + 24331768.

It is an arithmetic number, because the mean of its divisors is an integer number (97327048).

Almost surely, 2^340644661 is an apocalyptic number.

It is an amenable number.

340644661 is a deficient number, since it is larger than the sum of its proper divisors (48663531).

340644661 is an equidigital number, since it uses as much as digits as its factorization.

340644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48663530.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 340644661 is about 18456.5614619842. The cubic root of 340644661 is about 698.3940469818.

The spelling of 340644661 in words is "three hundred forty million, six hundred forty-four thousand, six hundred sixty-one".