456666421 has 2 divisors, whose sum is σ = 456666422. Its totient is φ = 456666420.

The previous prime is 456666389. The next prime is 456666433. The reversal of 456666421 is 124666654.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349316100 + 107350321 = 18690^2 + 10361^2 .

It is a cyclic number.

It is not a de Polignac number, because 456666421 - 2⁵ = 456666389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (456666521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228333210 + 228333211.

It is an arithmetic number, because the mean of its divisors is an integer number (228333211).

Almost surely, 2^456666421 is an apocalyptic number.

It is an amenable number.

456666421 is a deficient number, since it is larger than the sum of its proper divisors (1).

456666421 is an equidigital number, since it uses as much as digits as its factorization.

456666421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 40.

The square root of 456666421 is about 21369.7548184344. The cubic root of 456666421 is about 770.0750030948.

The spelling of 456666421 in words is "four hundred fifty-six million, six hundred sixty-six thousand, four hundred twenty-one".