11994447887 has 2 divisors, whose sum is σ = 11994447888. Its totient is φ = 11994447886.

The previous prime is 11994447841. The next prime is 11994447917. The reversal of 11994447887 is 78874449911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11994447887 - 2⁶ = 11994447823 is a prime.

It is a super-2 number, since 2×11994447887² (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 (11994447827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5997223943 + 5997223944.

It is an arithmetic number, because the mean of its divisors is an integer number (5997223944).

Almost surely, 2^11994447887 is an apocalyptic number.

11994447887 is a deficient number, since it is larger than the sum of its proper divisors (1).

11994447887 is an equidigital number, since it uses as much as digits as its factorization.

11994447887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 62.

The spelling of 11994447887 in words is "eleven billion, nine hundred ninety-four million, four hundred forty-seven thousand, eight hundred eighty-seven".