66177816352 has 24 divisors (see below), whose sum is σ = 130296127500. Its totient is φ = 33086736384.

The previous prime is 66177816337. The next prime is 66177816407. The reversal of 66177816352 is 25361877166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48984312976 + 17193503376 = 221324^2 + 131124^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66177816352.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500524 + ... + 618772.

Almost surely, 2^66177816352 is an apocalyptic number.

It is an amenable number.

66177816352 is a deficient number, since it is larger than the sum of its proper divisors (64118311148).

66177816352 is a wasteful number, since it uses less digits than its factorization.

66177816352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135748 (or 135740 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 52.

The spelling of 66177816352 in words is "sixty-six billion, one hundred seventy-seven million, eight hundred sixteen thousand, three hundred fifty-two".