665636378012 has 12 divisors (see below), whose sum is σ = 1164874231920. Its totient is φ = 332815168896.

The previous prime is 665636378009. The next prime is 665636378053. The reversal of 665636378012 is 210873636566.

665636378012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216437 + ... + 1173932.

It is an arithmetic number, because the mean of its divisors is an integer number (97072852660).

Almost surely, 2^665636378012 is an apocalyptic number.

It is an amenable number.

665636378012 is a deficient number, since it is larger than the sum of its proper divisors (499237853908).

665636378012 is a wasteful number, since it uses less digits than its factorization.

665636378012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510060 (or 1510058 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 665636378012 in words is "six hundred sixty-five billion, six hundred thirty-six million, three hundred seventy-eight thousand, twelve".