667278793 has 4 divisors (see below), whose sum is σ = 675725440. Its totient is φ = 658832148.

The previous prime is 667278767. The next prime is 667278797. The reversal of 667278793 is 397872766.

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 667278793 - 2⁹ = 667278281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667278797) 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, 4223205 + ... + 4223362.

It is an arithmetic number, because the mean of its divisors is an integer number (168931360).

Almost surely, 2^667278793 is an apocalyptic number.

It is an amenable number.

667278793 is a deficient number, since it is larger than the sum of its proper divisors (8446647).

667278793 is an equidigital number, since it uses as much as digits as its factorization.

667278793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8446646.

The product of its digits is 5334336, while the sum is 55.

The square root of 667278793 is about 25831.7400304354. The cubic root of 667278793 is about 873.8477537490.

The spelling of 667278793 in words is "six hundred sixty-seven million, two hundred seventy-eight thousand, seven hundred ninety-three".