667453791 has 4 divisors (see below), whose sum is σ = 889938392. Its totient is φ = 444969192.

The previous prime is 667453789. The next prime is 667453817. The reversal of 667453791 is 197354766.

It is a happy number.

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

It is not a de Polignac number, because 667453791 - 2¹ = 667453789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667453791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667453741) 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, 111242296 + ... + 111242301.

It is an arithmetic number, because the mean of its divisors is an integer number (222484598).

Almost surely, 2^667453791 is an apocalyptic number.

667453791 is a deficient number, since it is larger than the sum of its proper divisors (222484601).

667453791 is a wasteful number, since it uses less digits than its factorization.

667453791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222484600.

The product of its digits is 952560, while the sum is 48.

The square root of 667453791 is about 25835.1270753600. The cubic root of 667453791 is about 873.9241377355.

The spelling of 667453791 in words is "six hundred sixty-seven million, four hundred fifty-three thousand, seven hundred ninety-one".