665637870226 has 16 divisors (see below), whose sum is σ = 1147005897984. Its totient is φ = 283795271424.

The previous prime is 665637870221. The next prime is 665637870239. The reversal of 665637870226 is 622078736566.

It is not an unprimeable number, because it can be changed into a prime (665637870221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123172330 + ... + 123177733.

It is an arithmetic number, because the mean of its divisors is an integer number (71687868624).

Almost surely, 2^665637870226 is an apocalyptic number.

665637870226 is a deficient number, since it is larger than the sum of its proper divisors (481368027758).

665637870226 is a wasteful number, since it uses less digits than its factorization.

665637870226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246350265.

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 665637870226 in words is "six hundred sixty-five billion, six hundred thirty-seven million, eight hundred seventy thousand, two hundred twenty-six".