661323043662 has 48 divisors (see below), whose sum is σ = 1344128421888. Its totient is φ = 216914026000.

The previous prime is 661323043643. The next prime is 661323043727. The reversal of 661323043662 is 266340323166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10342963 + ... + 10406705.

It is an arithmetic number, because the mean of its divisors is an integer number (28002675456).

Almost surely, 2^661323043662 is an apocalyptic number.

661323043662 is an abundant number, since it is smaller than the sum of its proper divisors (682805378226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661323043662 is a wasteful number, since it uses less digits than its factorization.

661323043662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64165 (or 64082 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 42.

The spelling of 661323043662 in words is "six hundred sixty-one billion, three hundred twenty-three million, forty-three thousand, six hundred sixty-two".