667956263 has 4 divisors (see below), whose sum is σ = 719337528. Its totient is φ = 616575000.

The previous prime is 667956253. The next prime is 667956307. The reversal of 667956263 is 362659766.

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 667956263 - 2⁶ = 667956199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667956203) 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, 25690613 + ... + 25690638.

It is an arithmetic number, because the mean of its divisors is an integer number (179834382).

Almost surely, 2^667956263 is an apocalyptic number.

667956263 is a deficient number, since it is larger than the sum of its proper divisors (51381265).

667956263 is a wasteful number, since it uses less digits than its factorization.

667956263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51381264.

The product of its digits is 2449440, while the sum is 50.

The square root of 667956263 is about 25844.8498351219. The cubic root of 667956263 is about 874.1433850043.

The spelling of 667956263 in words is "six hundred sixty-seven million, nine hundred fifty-six thousand, two hundred sixty-three".