426665549 has 2 divisors, whose sum is σ = 426665550. Its totient is φ = 426665548.

The previous prime is 426665543. The next prime is 426665563. The reversal of 426665549 is 945566624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426422500 + 243049 = 20650^2 + 493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426665549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426665543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213332774 + 213332775.

It is an arithmetic number, because the mean of its divisors is an integer number (213332775).

Almost surely, 2^426665549 is an apocalyptic number.

It is an amenable number.

426665549 is a deficient number, since it is larger than the sum of its proper divisors (1).

426665549 is an equidigital number, since it uses as much as digits as its factorization.

426665549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 47.

The square root of 426665549 is about 20655.8841253528. The cubic root of 426665549 is about 752.8281657514.

The spelling of 426665549 in words is "four hundred twenty-six million, six hundred sixty-five thousand, five hundred forty-nine".