766945643 has 4 divisors (see below), whose sum is σ = 767045160. Its totient is φ = 766846128.

The previous prime is 766945639. The next prime is 766945703. The reversal of 766945643 is 346549667.

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 766945643 - 2² = 766945639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 766945591 and 766945600.

It is not an unprimeable number, because it can be changed into a prime (766945243) 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, 37130 + ... + 53967.

It is an arithmetic number, because the mean of its divisors is an integer number (191761290).

Almost surely, 2^766945643 is an apocalyptic number.

766945643 is a deficient number, since it is larger than the sum of its proper divisors (99517).

766945643 is an equidigital number, since it uses as much as digits as its factorization.

766945643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99516.

The product of its digits is 3265920, while the sum is 50.

The square root of 766945643 is about 27693.7834721080. The cubic root of 766945643 is about 915.3521266068.

The spelling of 766945643 in words is "seven hundred sixty-six million, nine hundred forty-five thousand, six hundred forty-three".