646767667 has 8 divisors (see below), whose sum is σ = 796021856. Its totient is φ = 511728192.

The previous prime is 646767637. The next prime is 646767673. The reversal of 646767667 is 766767646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646767667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646767607) 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, 3553578 + ... + 3553759.

It is an arithmetic number, because the mean of its divisors is an integer number (99502732).

Almost surely, 2^646767667 is an apocalyptic number.

646767667 is a deficient number, since it is larger than the sum of its proper divisors (149254189).

646767667 is a wasteful number, since it uses less digits than its factorization.

646767667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107357.

The product of its digits is 10668672, while the sum is 55.

The square root of 646767667 is about 25431.6272975207. The cubic root of 646767667 is about 864.8008348971.

The spelling of 646767667 in words is "six hundred forty-six million, seven hundred sixty-seven thousand, six hundred sixty-seven".