66812787107 has 16 divisors (see below), whose sum is σ = 76268544000. Its totient is φ = 57974356800.

The previous prime is 66812787103. The next prime is 66812787109. The reversal of 66812787107 is 70178721866.

It is a cyclic number.

It is not a de Polignac number, because 66812787107 - 2² = 66812787103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66812787103) 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, 1317107 + ... + 1366892.

It is an arithmetic number, because the mean of its divisors is an integer number (4766784000).

Almost surely, 2^66812787107 is an apocalyptic number.

66812787107 is a deficient number, since it is larger than the sum of its proper divisors (9455756893).

66812787107 is a wasteful number, since it uses less digits than its factorization.

66812787107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684114.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The spelling of 66812787107 in words is "sixty-six billion, eight hundred twelve million, seven hundred eighty-seven thousand, one hundred seven".