766321990999 has 2 divisors, whose sum is σ = 766321991000. Its totient is φ = 766321990998.

The previous prime is 766321990937. The next prime is 766321991003. The reversal of 766321990999 is 999099123667.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 766321990999 - 2⁷ = 766321990871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766321990909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383160995499 + 383160995500.

It is an arithmetic number, because the mean of its divisors is an integer number (383160995500).

Almost surely, 2^766321990999 is an apocalyptic number.

766321990999 is a deficient number, since it is larger than the sum of its proper divisors (1).

766321990999 is an equidigital number, since it uses as much as digits as its factorization.

766321990999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89282088, while the sum is 70.

The spelling of 766321990999 in words is "seven hundred sixty-six billion, three hundred twenty-one million, nine hundred ninety thousand, nine hundred ninety-nine".