66781105 has 16 divisors (see below), whose sum is σ = 85236480. Its totient is φ = 50084352.

The previous prime is 66781103. The next prime is 66781123. The reversal of 66781105 is 50118766.

It is a cyclic number.

It is not a de Polignac number, because 66781105 - 2¹ = 66781103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66781103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5592 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (5327280).

Almost surely, 2^66781105 is an apocalyptic number.

It is an amenable number.

66781105 is a deficient number, since it is larger than the sum of its proper divisors (18455375).

66781105 is a wasteful number, since it uses less digits than its factorization.

66781105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 66781105 is about 8171.9706925564. The cubic root of 66781105 is about 405.7120127623.

The spelling of 66781105 in words is "sixty-six million, seven hundred eighty-one thousand, one hundred five".