766878773 has 2 divisors, whose sum is σ = 766878774. Its totient is φ = 766878772.

The previous prime is 766878769. The next prime is 766878787. The reversal of 766878773 is 377878667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605258404 + 161620369 = 24602^2 + 12713^2 .

It is a cyclic number.

It is not a de Polignac number, because 766878773 - 2² = 766878769 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766878173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383439386 + 383439387.

It is an arithmetic number, because the mean of its divisors is an integer number (383439387).

Almost surely, 2^766878773 is an apocalyptic number.

It is an amenable number.

766878773 is a deficient number, since it is larger than the sum of its proper divisors (1).

766878773 is an equidigital number, since it uses as much as digits as its factorization.

766878773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 59.

The square root of 766878773 is about 27692.5761351305. The cubic root of 766878773 is about 915.3255226459.

The spelling of 766878773 in words is "seven hundred sixty-six million, eight hundred seventy-eight thousand, seven hundred seventy-three".