442626661 has 2 divisors, whose sum is σ = 442626662. Its totient is φ = 442626660.

The previous prime is 442626643. The next prime is 442626677. The reversal of 442626661 is 166626244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385336900 + 57289761 = 19630^2 + 7569^2 .

It is a cyclic number.

It is not a de Polignac number, because 442626661 - 2⁷ = 442626533 is a prime.

It is a super-2 number, since 2×442626661² = 391836722056017842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 442626661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442626601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221313330 + 221313331.

It is an arithmetic number, because the mean of its divisors is an integer number (221313331).

Almost surely, 2^442626661 is an apocalyptic number.

It is an amenable number.

442626661 is a deficient number, since it is larger than the sum of its proper divisors (1).

442626661 is an equidigital number, since it uses as much as digits as its factorization.

442626661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 442626661 is about 21038.6943748893. The cubic root of 442626661 is about 762.1009853922.

The spelling of 442626661 in words is "four hundred forty-two million, six hundred twenty-six thousand, six hundred sixty-one".