667808963 has 8 divisors (see below), whose sum is σ = 684502896. Its totient is φ = 651168000.

The previous prime is 667808951. The next prime is 667808969. The reversal of 667808963 is 369808766.

It is a Cunningham number, because it is equal to 25842²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667808963 - 2⁸ = 667808707 is a prime.

It is a super-2 number, since 2×667808963² = 891937622126270738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667808969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12923 + ... + 38763.

It is an arithmetic number, because the mean of its divisors is an integer number (85562862).

Almost surely, 2^667808963 is an apocalyptic number.

667808963 is a deficient number, since it is larger than the sum of its proper divisors (16693933).

667808963 is a wasteful number, since it uses less digits than its factorization.

667808963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26485.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 667808963 is about 25841.9999806517. Note that the first 4 decimals coincide. The cubic root of 667808963 is about 874.0791239172.

The spelling of 667808963 in words is "six hundred sixty-seven million, eight hundred eight thousand, nine hundred sixty-three".