646607047 has 2 divisors, whose sum is σ = 646607048. Its totient is φ = 646607046.

The previous prime is 646607041. The next prime is 646607111. The reversal of 646607047 is 740706646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646607047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646607041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323303523 + 323303524.

It is an arithmetic number, because the mean of its divisors is an integer number (323303524).

Almost surely, 2^646607047 is an apocalyptic number.

646607047 is a deficient number, since it is larger than the sum of its proper divisors (1).

646607047 is an equidigital number, since it uses as much as digits as its factorization.

646607047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 646607047 is about 25428.4692225073. The cubic root of 646607047 is about 864.7292399915.

The spelling of 646607047 in words is "six hundred forty-six million, six hundred seven thousand, forty-seven".