666666888999999 has 32 divisors (see below), whose sum is σ = 962412287041536. Its totient is φ = 409579242024960.

The previous prime is 666666888999961. The next prime is 666666889000039. The reversal of 666666888999999 is 999999888666666.

It is not a de Polignac number, because 666666888999999 - 2³¹ = 666664741516351 is a prime.

666666888999999 is a strobogrammatic number because it is the same when read upside-down.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666888999959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2060925442 + ... + 2061248895.

It is an arithmetic number, because the mean of its divisors is an integer number (30075383970048).

Almost surely, 2^{666666888999999} is an apocalyptic number.

666666888999999 is a deficient number, since it is larger than the sum of its proper divisors (295745398041537).

666666888999999 is a wasteful number, since it uses less digits than its factorization.

666666888999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122174455.

The product of its digits is 12694994583552, while the sum is 114.

The spelling of 666666888999999 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, eight hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".