1171997975899 has 2 divisors, whose sum is σ = 1171997975900. Its totient is φ = 1171997975898.

The previous prime is 1171997975861. The next prime is 1171997975923. The reversal of 1171997975899 is 9985797991711.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1171997975899 - 2¹¹ = 1171997973851 is a prime.

It is a super-2 number, since 2×1171997975899² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1171997975699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585998987949 + 585998987950.

It is an arithmetic number, because the mean of its divisors is an integer number (585998987950).

Almost surely, 2^{1171997975899} is an apocalyptic number.

1171997975899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171997975899 is an equidigital number, since it uses as much as digits as its factorization.

1171997975899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810152280, while the sum is 82.

The spelling of 1171997975899 in words is "one trillion, one hundred seventy-one billion, nine hundred ninety-seven million, nine hundred seventy-five thousand, eight hundred ninety-nine".