342640661 has 32 divisors (see below), whose sum is σ = 420577920. Its totient is φ = 277390080.

The previous prime is 342640657. The next prime is 342640663. The reversal of 342640661 is 166046243.

It is not a de Polignac number, because 342640661 - 2² = 342640657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342640663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429515 + ... + 430311.

It is an arithmetic number, because the mean of its divisors is an integer number (13143060).

Almost surely, 2^342640661 is an apocalyptic number.

It is an amenable number.

342640661 is a deficient number, since it is larger than the sum of its proper divisors (77937259).

342640661 is a wasteful number, since it uses less digits than its factorization.

342640661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 342640661 is about 18510.5553941528. Note that the first 3 decimals coincide. The cubic root of 342640661 is about 699.7554662867.

The spelling of 342640661 in words is "three hundred forty-two million, six hundred forty thousand, six hundred sixty-one".