9864661087 has 2 divisors, whose sum is σ = 9864661088. Its totient is φ = 9864661086.

The previous prime is 9864661021. The next prime is 9864661097. The reversal of 9864661087 is 7801664689.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9864661087 - 2⁷ = 9864660959 is a prime.

It is a super-2 number, since 2×9864661087² (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 (9864661097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932330543 + 4932330544.

It is an arithmetic number, because the mean of its divisors is an integer number (4932330544).

Almost surely, 2^9864661087 is an apocalyptic number.

9864661087 is a deficient number, since it is larger than the sum of its proper divisors (1).

9864661087 is an equidigital number, since it uses as much as digits as its factorization.

9864661087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 9864661087 is about 99321.0002315724. Note that the first 3 decimals coincide. The cubic root of 9864661087 is about 2144.6712157558.

The spelling of 9864661087 in words is "nine billion, eight hundred sixty-four million, six hundred sixty-one thousand, eighty-seven".