666395047 has 8 divisors (see below), whose sum is σ = 670320000. Its totient is φ = 662479224.

The previous prime is 666395021. The next prime is 666395057. The reversal of 666395047 is 740593666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666395047 is a prime.

It is a super-2 number, since 2×666395047² = 888164717332264418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666394988 and 666395006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666395057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188704 + ... + 192202.

It is an arithmetic number, because the mean of its divisors is an integer number (83790000).

Almost surely, 2^666395047 is an apocalyptic number.

666395047 is a deficient number, since it is larger than the sum of its proper divisors (3924953).

666395047 is a wasteful number, since it uses less digits than its factorization.

666395047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565.

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 666395047 is about 25814.6285466206. The cubic root of 666395047 is about 873.4618078027.

The spelling of 666395047 in words is "six hundred sixty-six million, three hundred ninety-five thousand, forty-seven".