11671081167821 has 2 divisors, whose sum is σ = 11671081167822. Its totient is φ = 11671081167820.

The previous prime is 11671081167751. The next prime is 11671081167859. The reversal of 11671081167821 is 12876118017611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9245181466921 + 2425899700900 = 3040589^2 + 1557530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11671081167821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11671081167821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11671081163821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5835540583910 + 5835540583911.

It is an arithmetic number, because the mean of its divisors is an integer number (5835540583911).

Almost surely, 2^{11671081167821} is an apocalyptic number.

It is an amenable number.

11671081167821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11671081167821 is an equidigital number, since it uses as much as digits as its factorization.

11671081167821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 50.

The spelling of 11671081167821 in words is "eleven trillion, six hundred seventy-one billion, eighty-one million, one hundred sixty-seven thousand, eight hundred twenty-one".