766664403 has 4 divisors (see below), whose sum is σ = 1022219208. Its totient is φ = 511109600.

The previous prime is 766664401. The next prime is 766664407. The reversal of 766664403 is 304466667.

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 766664403 - 2¹ = 766664401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (766664401) 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, 127777398 + ... + 127777403.

It is an arithmetic number, because the mean of its divisors is an integer number (255554802).

Almost surely, 2^766664403 is an apocalyptic number.

766664403 is a deficient number, since it is larger than the sum of its proper divisors (255554805).

766664403 is a wasteful number, since it uses less digits than its factorization.

766664403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255554804.

The product of its (nonzero) digits is 435456, while the sum is 42.

The square root of 766664403 is about 27688.7053326803. The cubic root of 766664403 is about 915.2402259752.

The spelling of 766664403 in words is "seven hundred sixty-six million, six hundred sixty-four thousand, four hundred three".