10665433421891 has 2 divisors, whose sum is σ = 10665433421892. Its totient is φ = 10665433421890.

The previous prime is 10665433421857. The next prime is 10665433421893. The reversal of 10665433421891 is 19812433456601.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10665433421891 - 2⁶ = 10665433421827 is a prime.

It is a super-2 number, since 2×10665433421891² (a number of 27 digits) contains 22 as substring.

Together with 10665433421893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10665433421893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332716710945 + 5332716710946.

It is an arithmetic number, because the mean of its divisors is an integer number (5332716710946).

Almost surely, 2^{10665433421891} is an apocalyptic number.

10665433421891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10665433421891 is an equidigital number, since it uses as much as digits as its factorization.

10665433421891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 10665433421891 in words is "ten trillion, six hundred sixty-five billion, four hundred thirty-three million, four hundred twenty-one thousand, eight hundred ninety-one".