766321999999 has 4 divisors (see below), whose sum is σ = 776022278560. Its totient is φ = 756621721440.

The previous prime is 766321999981. The next prime is 766322000009. The reversal of 766321999999 is 999999123667.

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 766321999999 - 2⁷ = 766321999871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (79), and also a Moran number because the ratio is a prime number: 9700278481 = 766321999999 / (7 + 6 + 6 + 3 + 2 + 1 + 9 + 9 + 9 + 9 + 9 + 9).

It is a Duffinian number.

766321999999 is a modest number, since divided by 999999 gives 766321 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766321990999) 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, 4850139162 + ... + 4850139319.

It is an arithmetic number, because the mean of its divisors is an integer number (194005569640).

Almost surely, 2^766321999999 is an apocalyptic number.

766321999999 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

766321999999 is a deficient number, since it is larger than the sum of its proper divisors (9700278561).

766321999999 is an equidigital number, since it uses as much as digits as its factorization.

766321999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9700278560.

The product of its digits is 803538792, while the sum is 79.

The spelling of 766321999999 in words is "seven hundred sixty-six billion, three hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".