187322764861 has 2 divisors, whose sum is σ = 187322764862. Its totient is φ = 187322764860.

The previous prime is 187322764859. The next prime is 187322764883. The reversal of 187322764861 is 168467223781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180035581636 + 7287183225 = 424306^2 + 85365^2 .

It is a cyclic number.

It is not a de Polignac number, because 187322764861 - 2¹ = 187322764859 is a prime.

Together with 187322764859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187322764061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93661382430 + 93661382431.

It is an arithmetic number, because the mean of its divisors is an integer number (93661382431).

Almost surely, 2^187322764861 is an apocalyptic number.

It is an amenable number.

187322764861 is a deficient number, since it is larger than the sum of its proper divisors (1).

187322764861 is an equidigital number, since it uses as much as digits as its factorization.

187322764861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 55.

The spelling of 187322764861 in words is "one hundred eighty-seven billion, three hundred twenty-two million, seven hundred sixty-four thousand, eight hundred sixty-one".