18187059197 has 2 divisors, whose sum is σ = 18187059198. Its totient is φ = 18187059196.

The previous prime is 18187059167. The next prime is 18187059211. The reversal of 18187059197 is 79195078181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14385843481 + 3801215716 = 119941^2 + 61654^2 .

It is a cyclic number.

It is not a de Polignac number, because 18187059197 - 2¹⁴ = 18187042813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18187059157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093529598 + 9093529599.

It is an arithmetic number, because the mean of its divisors is an integer number (9093529599).

Almost surely, 2^18187059197 is an apocalyptic number.

It is an amenable number.

18187059197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18187059197 is an equidigital number, since it uses as much as digits as its factorization.

18187059197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 56.

The spelling of 18187059197 in words is "eighteen billion, one hundred eighty-seven million, fifty-nine thousand, one hundred ninety-seven".