6666699999 has 16 divisors (see below), whose sum is σ = 9139382784. Its totient is φ = 4320043200.

The previous prime is 6666699979. The next prime is 6666700039. The reversal of 6666699999 is 9999966666.

It is not a de Polignac number, because 6666699999 - 2⁵ = 6666699967 is a prime.

6666699999 is a strobogrammatic number because it is the same when read upside-down.

6666699999 is a modest number, since divided by 99999 gives 66666 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6666699999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666699929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66669 + ... + 133334.

It is an arithmetic number, because the mean of its divisors is an integer number (571211424).

Almost surely, 2^6666699999 is an apocalyptic number.

6666699999 is a deficient number, since it is larger than the sum of its proper divisors (2472682785).

6666699999 is a wasteful number, since it uses less digits than its factorization.

6666699999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200318.

The product of its digits is 459165024, while the sum is 75.

The square root of 6666699999 is about 81649.8622105390. The cubic root of 6666699999 is about 1882.0751944495.

The spelling of 6666699999 in words is "six billion, six hundred sixty-six million, six hundred ninety-nine thousand, nine hundred ninety-nine".