667783889 has 4 divisors (see below), whose sum is σ = 679102320. Its totient is φ = 656465460.

The previous prime is 667783873. The next prime is 667783901. The reversal of 667783889 is 988387766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667783889 - 2⁴ = 667783873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667783819) 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, 5659127 + ... + 5659244.

It is an arithmetic number, because the mean of its divisors is an integer number (169775580).

Almost surely, 2^667783889 is an apocalyptic number.

It is an amenable number.

667783889 is a deficient number, since it is larger than the sum of its proper divisors (11318431).

667783889 is a wasteful number, since it uses less digits than its factorization.

667783889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11318430.

The product of its digits is 24385536, while the sum is 62.

The square root of 667783889 is about 25841.5148356283. The cubic root of 667783889 is about 874.0681841947.

The spelling of 667783889 in words is "six hundred sixty-seven million, seven hundred eighty-three thousand, eight hundred eighty-nine".