6665666087 has 12 divisors (see below), whose sum is σ = 6980766744. Its totient is φ = 6364245360.

The previous prime is 6665666083. The next prime is 6665666093. The reversal of 6665666087 is 7806665666.

It is not a de Polignac number, because 6665666087 - 2² = 6665666083 is a prime.

It is a super-2 number, since 2×6665666087² = 88862208766763783138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665666083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286637 + ... + 309017.

It is an arithmetic number, because the mean of its divisors is an integer number (581730562).

Almost surely, 2^6665666087 is an apocalyptic number.

6665666087 is a deficient number, since it is larger than the sum of its proper divisors (315100657).

6665666087 is a wasteful number, since it uses less digits than its factorization.

6665666087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22990 (or 22967 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 56.

The square root of 6665666087 is about 81643.5305887735. The cubic root of 6665666087 is about 1881.9778948994.

The spelling of 6665666087 in words is "six billion, six hundred sixty-five million, six hundred sixty-six thousand, eighty-seven".