667401047 has 4 divisors (see below), whose sum is σ = 670193760. Its totient is φ = 664608336.

The previous prime is 667401043. The next prime is 667401071. The reversal of 667401047 is 740104766.

It is a happy number.

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 667401047 - 2² = 667401043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667400998 and 667401016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667401043) 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, 1395998 + ... + 1396475.

It is an arithmetic number, because the mean of its divisors is an integer number (167548440).

Almost surely, 2^667401047 is an apocalyptic number.

667401047 is a deficient number, since it is larger than the sum of its proper divisors (2792713).

667401047 is a wasteful number, since it uses less digits than its factorization.

667401047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792712.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 667401047 is about 25834.1062744582. The cubic root of 667401047 is about 873.9011171811.

The spelling of 667401047 in words is "six hundred sixty-seven million, four hundred one thousand, forty-seven".