11155990399 has 2 divisors, whose sum is σ = 11155990400. Its totient is φ = 11155990398.

The previous prime is 11155990379. The next prime is 11155990499. The reversal of 11155990399 is 99309955111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11155990399 - 2²³ = 11147601791 is a prime.

It is a super-2 number, since 2×11155990399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11155990369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577995199 + 5577995200.

It is an arithmetic number, because the mean of its divisors is an integer number (5577995200).

Almost surely, 2^11155990399 is an apocalyptic number.

11155990399 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155990399 is an equidigital number, since it uses as much as digits as its factorization.

11155990399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 492075, while the sum is 52.

The spelling of 11155990399 in words is "eleven billion, one hundred fifty-five million, nine hundred ninety thousand, three hundred ninety-nine".