647666011 has 2 divisors, whose sum is σ = 647666012. Its totient is φ = 647666010.

The previous prime is 647666003. The next prime is 647666021. The reversal of 647666011 is 110666746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647666011 - 2³ = 647666003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647666021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323833005 + 323833006.

It is an arithmetic number, because the mean of its divisors is an integer number (323833006).

Almost surely, 2^647666011 is an apocalyptic number.

647666011 is a deficient number, since it is larger than the sum of its proper divisors (1).

647666011 is an equidigital number, since it uses as much as digits as its factorization.

647666011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 647666011 is about 25449.2831136753. The cubic root of 647666011 is about 865.2010451866.

The spelling of 647666011 in words is "six hundred forty-seven million, six hundred sixty-six thousand, eleven".