661023316364 has 12 divisors (see below), whose sum is σ = 1224837321624. Its totient is φ = 311069795904.

The previous prime is 661023316319. The next prime is 661023316367. The reversal of 661023316364 is 463613320166.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (661023316367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4860465494 + ... + 4860465629.

It is an arithmetic number, because the mean of its divisors is an integer number (102069776802).

Almost surely, 2^661023316364 is an apocalyptic number.

It is an amenable number.

661023316364 is a deficient number, since it is larger than the sum of its proper divisors (563814005260).

661023316364 is a wasteful number, since it uses less digits than its factorization.

661023316364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720931144 (or 9720931142 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 661023316364 in words is "six hundred sixty-one billion, twenty-three million, three hundred sixteen thousand, three hundred sixty-four".