766663 has 4 divisors (see below), whose sum is σ = 769120. Its totient is φ = 764208.

The previous prime is 766651. The next prime is 766679. The reversal of 766663 is 366667.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-766663 is a prime.

It is an Ulam number.

It is a Duffinian number.

766663 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766163) 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, 678 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (192280).

2⁷⁶⁶⁶⁶³ is an apocalyptic number.

766663 is a deficient number, since it is larger than the sum of its proper divisors (2457).

766663 is a wasteful number, since it uses less digits than its factorization.

766663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456.

The product of its digits is 27216, while the sum is 34.

The square root of 766663 is about 875.5929419542. The cubic root of 766663 is about 91.5239667677.

The spelling of 766663 in words is "seven hundred sixty-six thousand, six hundred sixty-three".