66733953568 has 12 divisors (see below), whose sum is σ = 131382471150. Its totient is φ = 33366976768.

The previous prime is 66733953551. The next prime is 66733953613. The reversal of 66733953568 is 86535933766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57824859024 + 8909094544 = 240468^2 + 94388^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1042717993 + ... + 1042718056.

Almost surely, 2^66733953568 is an apocalyptic number.

It is an amenable number.

66733953568 is a deficient number, since it is larger than the sum of its proper divisors (64648517582).

66733953568 is a wasteful number, since it uses less digits than its factorization.

66733953568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085436059 (or 2085436051 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 61.

The spelling of 66733953568 in words is "sixty-six billion, seven hundred thirty-three million, nine hundred fifty-three thousand, five hundred sixty-eight".