999766667999 has 4 divisors (see below), whose sum is σ = 1090654546920. Its totient is φ = 908878789080.

The previous prime is 999766667993. The next prime is 999766668029.

999766667999 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999766667999 - 2⁸ = 999766667743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999766667993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45443939444 + ... + 45443939465.

It is an arithmetic number, because the mean of its divisors is an integer number (272663636730).

Almost surely, 2^999766667999 is an apocalyptic number.

999766667999 is a deficient number, since it is larger than the sum of its proper divisors (90887878921).

999766667999 is a wasteful number, since it uses less digits than its factorization.

999766667999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90887878920.

The product of its digits is 33748629264, while the sum is 92.

The spelling of 999766667999 in words is "nine hundred ninety-nine billion, seven hundred sixty-six million, six hundred sixty-seven thousand, nine hundred ninety-nine".