32196766781 has 2 divisors, whose sum is σ = 32196766782. Its totient is φ = 32196766780.

The previous prime is 32196766717. The next prime is 32196766783. The reversal of 32196766781 is 18766769123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31951562500 + 245204281 = 178750^2 + 15659^2 .

It is a cyclic number.

It is not a de Polignac number, because 32196766781 - 2⁶ = 32196766717 is a prime.

It is a super-2 number, since 2×32196766781² (a number of 22 digits) contains 22 as substring.

Together with 32196766783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32196766783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16098383390 + 16098383391.

It is an arithmetic number, because the mean of its divisors is an integer number (16098383391).

Almost surely, 2^32196766781 is an apocalyptic number.

It is an amenable number.

32196766781 is a deficient number, since it is larger than the sum of its proper divisors (1).

32196766781 is an equidigital number, since it uses as much as digits as its factorization.

32196766781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 56.

The spelling of 32196766781 in words is "thirty-two billion, one hundred ninety-six million, seven hundred sixty-six thousand, seven hundred eighty-one".