661142423456 has 12 divisors (see below), whose sum is σ = 1301624146242. Its totient is φ = 330571211712.

The previous prime is 661142423443. The next prime is 661142423533. The reversal of 661142423456 is 654324241166.

661142423456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 352099824400 + 309042599056 = 593380^2 + 555916^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330350335 + ... + 10330350398.

Almost surely, 2^661142423456 is an apocalyptic number.

It is an amenable number.

661142423456 is a deficient number, since it is larger than the sum of its proper divisors (640481722786).

661142423456 is a wasteful number, since it uses less digits than its factorization.

661142423456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20660700743 (or 20660700735 counting only the distinct ones).

The product of its digits is 829440, while the sum is 44.

The spelling of 661142423456 in words is "six hundred sixty-one billion, one hundred forty-two million, four hundred twenty-three thousand, four hundred fifty-six".