66781532258050 has 12 divisors (see below), whose sum is σ = 124213650000066. Its totient is φ = 26712612903200.

The previous prime is 66781532258047. The next prime is 66781532258159. The reversal of 66781532258050 is 5085223518766.

It can be written as a sum of positive squares in 3 ways, for example, as 46981853457561 + 19799678800489 = 6854331^2 + 4449683^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667815322531 + ... + 667815322630.

Almost surely, 2^{66781532258050} is an apocalyptic number.

66781532258050 is a deficient number, since it is larger than the sum of its proper divisors (57432117742016).

66781532258050 is a wasteful number, since it uses less digits than its factorization.

66781532258050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335630645173 (or 1335630645168 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 58.

The spelling of 66781532258050 in words is "sixty-six trillion, seven hundred eighty-one billion, five hundred thirty-two million, two hundred fifty-eight thousand, fifty".