188040599909 has 2 divisors, whose sum is σ = 188040599910. Its totient is φ = 188040599908.

The previous prime is 188040599867. The next prime is 188040599941. The reversal of 188040599909 is 909995040881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180514516900 + 7526083009 = 424870^2 + 86753^2 .

It is a cyclic number.

It is not a de Polignac number, because 188040599909 - 2¹⁶ = 188040534373 is a prime.

It is a super-2 number, since 2×188040599909² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188040599309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94020299954 + 94020299955.

It is an arithmetic number, because the mean of its divisors is an integer number (94020299955).

Almost surely, 2^188040599909 is an apocalyptic number.

It is an amenable number.

188040599909 is a deficient number, since it is larger than the sum of its proper divisors (1).

188040599909 is an equidigital number, since it uses as much as digits as its factorization.

188040599909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 62.

The spelling of 188040599909 in words is "one hundred eighty-eight billion, forty million, five hundred ninety-nine thousand, nine hundred nine".