668005047 has 6 divisors (see below), whose sum is σ = 964896192. Its totient is φ = 445336692.

The previous prime is 668005033. The next prime is 668005061. The reversal of 668005047 is 740500866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (668005033) and next prime (668005061).

It is not a de Polignac number, because 668005047 - 2¹² = 668000951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668005007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37111383 + ... + 37111400.

It is an arithmetic number, because the mean of its divisors is an integer number (160816032).

Almost surely, 2^668005047 is an apocalyptic number.

668005047 is a deficient number, since it is larger than the sum of its proper divisors (296891145).

668005047 is a wasteful number, since it uses less digits than its factorization.

668005047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74222789 (or 74222786 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 668005047 is about 25845.7936036021. The cubic root of 668005047 is about 874.1646654260.

The spelling of 668005047 in words is "six hundred sixty-eight million, five thousand, forty-seven".