10643421697 has 2 divisors, whose sum is σ = 10643421698. Its totient is φ = 10643421696.

The previous prime is 10643421661. The next prime is 10643421721. The reversal of 10643421697 is 79612434601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10243261681 + 400160016 = 101209^2 + 20004^2 .

It is a cyclic number.

It is not a de Polignac number, because 10643421697 - 2¹⁹ = 10642897409 is a prime.

It is a super-2 number, since 2×10643421697² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10643422697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321710848 + 5321710849.

It is an arithmetic number, because the mean of its divisors is an integer number (5321710849).

Almost surely, 2^10643421697 is an apocalyptic number.

It is an amenable number.

10643421697 is a deficient number, since it is larger than the sum of its proper divisors (1).

10643421697 is an equidigital number, since it uses as much as digits as its factorization.

10643421697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 10643421697 in words is "ten billion, six hundred forty-three million, four hundred twenty-one thousand, six hundred ninety-seven".