32191613077721 has 2 divisors, whose sum is σ = 32191613077722. Its totient is φ = 32191613077720.

The previous prime is 32191613077651. The next prime is 32191613077733. The reversal of 32191613077721 is 12777031619123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32191280197696 + 332880025 = 5673736^2 + 18245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32191613077721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 32191613077721.

It is not a weakly prime, because it can be changed into another prime (32191613077751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16095806538860 + 16095806538861.

It is an arithmetic number, because the mean of its divisors is an integer number (16095806538861).

Almost surely, 2^{32191613077721} is an apocalyptic number.

It is an amenable number.

32191613077721 is a deficient number, since it is larger than the sum of its proper divisors (1).

32191613077721 is an equidigital number, since it uses as much as digits as its factorization.

32191613077721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 666792, while the sum is 50.

The spelling of 32191613077721 in words is "thirty-two trillion, one hundred ninety-one billion, six hundred thirteen million, seventy-seven thousand, seven hundred twenty-one".