186345499961 has 2 divisors, whose sum is σ = 186345499962. Its totient is φ = 186345499960.

The previous prime is 186345499943. The next prime is 186345499993. The reversal of 186345499961 is 169994543681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165991056400 + 20354443561 = 407420^2 + 142669^2 .

It is an emirp because it is prime and its reverse (169994543681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186345499961 - 2¹⁸ = 186345237817 is a prime.

It is not a weakly prime, because it can be changed into another prime (186345499261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93172749980 + 93172749981.

It is an arithmetic number, because the mean of its divisors is an integer number (93172749981).

Almost surely, 2^186345499961 is an apocalyptic number.

It is an amenable number.

186345499961 is a deficient number, since it is larger than the sum of its proper divisors (1).

186345499961 is an equidigital number, since it uses as much as digits as its factorization.

186345499961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50388480, while the sum is 65.

The spelling of 186345499961 in words is "one hundred eighty-six billion, three hundred forty-five million, four hundred ninety-nine thousand, nine hundred sixty-one".