647660666606 has 16 divisors (see below), whose sum is σ = 992387289600. Its totient is φ = 316914129528.

The previous prime is 647660666599. The next prime is 647660666621. The reversal of 647660666606 is 606666066746.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12280076 + ... + 12332703.

It is an arithmetic number, because the mean of its divisors is an integer number (62024205600).

Almost surely, 2^647660666606 is an apocalyptic number.

647660666606 is a deficient number, since it is larger than the sum of its proper divisors (344726622994).

647660666606 is a wasteful number, since it uses less digits than its factorization.

647660666606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24613063.

The product of its (nonzero) digits is 47029248, while the sum is 59.

The spelling of 647660666606 in words is "six hundred forty-seven billion, six hundred sixty million, six hundred sixty-six thousand, six hundred six".