426661602624221 has 2 divisors, whose sum is σ = 426661602624222. Its totient is φ = 426661602624220.

The previous prime is 426661602624163. The next prime is 426661602624227. The reversal of 426661602624221 is 122426206166624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314476667580100 + 112184935044121 = 17733490^2 + 10591739^2 .

It is a cyclic number.

It is not a de Polignac number, because 426661602624221 - 2¹⁸ = 426661602362077 is a prime.

It is a super-2 number, since 2×426661602624221² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 426661602624221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426661602624227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213330801312110 + 213330801312111.

It is an arithmetic number, because the mean of its divisors is an integer number (213330801312111).

Almost surely, 2^{426661602624221} is an apocalyptic number.

It is an amenable number.

426661602624221 is a deficient number, since it is larger than the sum of its proper divisors (1).

426661602624221 is an equidigital number, since it uses as much as digits as its factorization.

426661602624221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 50.

The spelling of 426661602624221 in words is "four hundred twenty-six trillion, six hundred sixty-one billion, six hundred two million, six hundred twenty-four thousand, two hundred twenty-one".