866664202646 has 16 divisors (see below), whose sum is σ = 1418263343568. Its totient is φ = 393914508000.

The previous prime is 866664202643. The next prime is 866664202661. The reversal of 866664202646 is 646202466668.

It is a happy number.

It is a super-2 number, since 2×866664202646² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866664202591 and 866664202600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866664202643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812705 + ... + 1547196.

It is an arithmetic number, because the mean of its divisors is an integer number (88641458973).

Almost surely, 2^866664202646 is an apocalyptic number.

866664202646 is a deficient number, since it is larger than the sum of its proper divisors (551599140922).

866664202646 is a wasteful number, since it uses less digits than its factorization.

866664202646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376607.

The product of its (nonzero) digits is 23887872, while the sum is 56.

The spelling of 866664202646 in words is "eight hundred sixty-six billion, six hundred sixty-four million, two hundred two thousand, six hundred forty-six".