1155666199 has 2 divisors, whose sum is σ = 1155666200. Its totient is φ = 1155666198.

The previous prime is 1155666179. The next prime is 1155666223. The reversal of 1155666199 is 9916665511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155666199 - 2¹⁵ = 1155633431 is a prime.

It is a super-2 number, since 2×1155666199² = 2671128727022215202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155666179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577833099 + 577833100.

It is an arithmetic number, because the mean of its divisors is an integer number (577833100).

Almost surely, 2^1155666199 is an apocalyptic number.

1155666199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155666199 is an equidigital number, since it uses as much as digits as its factorization.

1155666199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 49.

The square root of 1155666199 is about 33995.0908073504. The cubic root of 1155666199 is about 1049.4074355678.

The spelling of 1155666199 in words is "one billion, one hundred fifty-five million, six hundred sixty-six thousand, one hundred ninety-nine".