667447799 has 4 divisors (see below), whose sum is σ = 681648864. Its totient is φ = 653246736.

The previous prime is 667447793. The next prime is 667447801. The reversal of 667447799 is 997744766.

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 667447799 - 2¹⁶ = 667382263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667447793) 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, 7100462 + ... + 7100555.

It is an arithmetic number, because the mean of its divisors is an integer number (170412216).

Almost surely, 2^667447799 is an apocalyptic number.

667447799 is a deficient number, since it is larger than the sum of its proper divisors (14201065).

667447799 is a wasteful number, since it uses less digits than its factorization.

667447799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14201064.

The product of its digits is 16003008, while the sum is 59.

The square root of 667447799 is about 25835.0111089583. The cubic root of 667447799 is about 873.9215225387.

The spelling of 667447799 in words is "six hundred sixty-seven million, four hundred forty-seven thousand, seven hundred ninety-nine".