426343661 has 2 divisors, whose sum is σ = 426343662. Its totient is φ = 426343660.

The previous prime is 426343649. The next prime is 426343681. The reversal of 426343661 is 166343624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348568900 + 77774761 = 18670^2 + 8819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426343661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426343681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213171830 + 213171831.

It is an arithmetic number, because the mean of its divisors is an integer number (213171831).

Almost surely, 2^426343661 is an apocalyptic number.

It is an amenable number.

426343661 is a deficient number, since it is larger than the sum of its proper divisors (1).

426343661 is an equidigital number, since it uses as much as digits as its factorization.

426343661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

The square root of 426343661 is about 20648.0909771339. The cubic root of 426343661 is about 752.6388001636.

The spelling of 426343661 in words is "four hundred twenty-six million, three hundred forty-three thousand, six hundred sixty-one".