186153216721 has 2 divisors, whose sum is σ = 186153216722. Its totient is φ = 186153216720.

The previous prime is 186153216671. The next prime is 186153216749. The reversal of 186153216721 is 127612351681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115354650321 + 70798566400 = 339639^2 + 266080^2 .

It is an emirp because it is prime and its reverse (127612351681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186153216721 - 2³³ = 177563282129 is a prime.

It is not a weakly prime, because it can be changed into another prime (186153216761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93076608360 + 93076608361.

It is an arithmetic number, because the mean of its divisors is an integer number (93076608361).

Almost surely, 2^186153216721 is an apocalyptic number.

It is an amenable number.

186153216721 is a deficient number, since it is larger than the sum of its proper divisors (1).

186153216721 is an equidigital number, since it uses as much as digits as its factorization.

186153216721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The spelling of 186153216721 in words is "one hundred eighty-six billion, one hundred fifty-three million, two hundred sixteen thousand, seven hundred twenty-one".