6665549987 has 2 divisors, whose sum is σ = 6665549988. Its totient is φ = 6665549986.

The previous prime is 6665549981. The next prime is 6665549993. The reversal of 6665549987 is 7899455666.

It is a balanced prime because it is at equal distance from previous prime (6665549981) and next prime (6665549993).

It is a cyclic number.

It is not a de Polignac number, because 6665549987 - 2²² = 6661355683 is a prime.

It is not a weakly prime, because it can be changed into another prime (6665549981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332774993 + 3332774994.

It is an arithmetic number, because the mean of its divisors is an integer number (3332774994).

Almost surely, 2^6665549987 is an apocalyptic number.

6665549987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665549987 is an equidigital number, since it uses as much as digits as its factorization.

6665549987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97977600, while the sum is 65.

The square root of 6665549987 is about 81642.8195679204. The cubic root of 6665549987 is about 1881.9669683144.

The spelling of 6665549987 in words is "six billion, six hundred sixty-five million, five hundred forty-nine thousand, nine hundred eighty-seven".