426868553621 has 2 divisors, whose sum is σ = 426868553622. Its totient is φ = 426868553620.

The previous prime is 426868553611. The next prime is 426868553689. The reversal of 426868553621 is 126355868624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275928533521 + 150940020100 = 525289^2 + 388510^2 .

It is a cyclic number.

It is not a de Polignac number, because 426868553621 - 2²⁶ = 426801444757 is a prime.

It is a super-3 number, since 3×426868553621³ (a number of 36 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426868553611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213434276810 + 213434276811.

It is an arithmetic number, because the mean of its divisors is an integer number (213434276811).

Almost surely, 2^426868553621 is an apocalyptic number.

It is an amenable number.

426868553621 is a deficient number, since it is larger than the sum of its proper divisors (1).

426868553621 is an equidigital number, since it uses as much as digits as its factorization.

426868553621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16588800, while the sum is 56.

The spelling of 426868553621 in words is "four hundred twenty-six billion, eight hundred sixty-eight million, five hundred fifty-three thousand, six hundred twenty-one".