999766667998 has 32 divisors (see below), whose sum is σ = 1793042915328. Its totient is φ = 409126833600.

The previous prime is 999766667993. The next prime is 999766668029. The reversal of 999766667998 is 899766667999.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18502318 + ... + 18556273.

It is an arithmetic number, because the mean of its divisors is an integer number (56032591104).

Almost surely, 2^999766667998 is an apocalyptic number.

999766667998 is a deficient number, since it is larger than the sum of its proper divisors (793276247330).

999766667998 is a wasteful number, since it uses less digits than its factorization.

999766667998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37058688.

The product of its digits is 29998781568, while the sum is 91.

Subtracting from 999766667998 its reverse (899766667999), we obtain a palindrome (99999999999).

The spelling of 999766667998 in words is "nine hundred ninety-nine billion, seven hundred sixty-six million, six hundred sixty-seven thousand, nine hundred ninety-eight".