64221898441 has 2 divisors, whose sum is σ = 64221898442. Its totient is φ = 64221898440.

The previous prime is 64221898381. The next prime is 64221898453. The reversal of 64221898441 is 14489812246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55839580416 + 8382318025 = 236304^2 + 91555^2 .

It is a cyclic number.

It is not a de Polignac number, because 64221898441 - 2¹¹ = 64221896393 is a prime.

It is a super-2 number, since 2×64221898441² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64221898471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110949220 + 32110949221.

It is an arithmetic number, because the mean of its divisors is an integer number (32110949221).

Almost surely, 2^64221898441 is an apocalyptic number.

It is an amenable number.

64221898441 is a deficient number, since it is larger than the sum of its proper divisors (1).

64221898441 is an equidigital number, since it uses as much as digits as its factorization.

64221898441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 49.

The spelling of 64221898441 in words is "sixty-four billion, two hundred twenty-one million, eight hundred ninety-eight thousand, four hundred forty-one".