766329898997381 has 2 divisors, whose sum is σ = 766329898997382. Its totient is φ = 766329898997380.

The previous prime is 766329898997323. The next prime is 766329898997401. The reversal of 766329898997381 is 183799898923667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731961391396225 + 34368507601156 = 27054785^2 + 5862466^2 .

It is a cyclic number.

It is not a de Polignac number, because 766329898997381 - 2¹⁰ = 766329898996357 is a prime.

It is a super-2 number, since 2×766329898997381² (a number of 31 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766329898997281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383164949498690 + 383164949498691.

It is an arithmetic number, because the mean of its divisors is an integer number (383164949498691).

Almost surely, 2^{766329898997381} is an apocalyptic number.

It is an amenable number.

766329898997381 is a deficient number, since it is larger than the sum of its proper divisors (1).

766329898997381 is an equidigital number, since it uses as much as digits as its factorization.

766329898997381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106662334464, while the sum is 95.

The spelling of 766329898997381 in words is "seven hundred sixty-six trillion, three hundred twenty-nine billion, eight hundred ninety-eight million, nine hundred ninety-seven thousand, three hundred eighty-one".