646666260662 has 4 divisors (see below), whose sum is σ = 969999390996. Its totient is φ = 323333130330.

The previous prime is 646666260641. The next prime is 646666260673. The reversal of 646666260662 is 266062666646.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 646666260598 and 646666260607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161666565164 + ... + 161666565167.

It is an arithmetic number, because the mean of its divisors is an integer number (242499847749).

Almost surely, 2^646666260662 is an apocalyptic number.

646666260662 is a deficient number, since it is larger than the sum of its proper divisors (323333130334).

646666260662 is a wasteful number, since it uses less digits than its factorization.

646666260662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323333130333.

The product of its (nonzero) digits is 26873856, while the sum is 56.

The spelling of 646666260662 in words is "six hundred forty-six billion, six hundred sixty-six million, two hundred sixty thousand, six hundred sixty-two".