66077812607181 has 16 divisors (see below), whose sum is σ = 88488586304640. Its totient is φ = 43859669261760.

The previous prime is 66077812607173. The next prime is 66077812607227. The reversal of 66077812607181 is 18170621877066.

It is not a de Polignac number, because 66077812607181 - 2³ = 66077812607173 is a prime.

It is a super-2 number, since 2×66077812607181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66077812607101) 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, 25287790 + ... + 27778191.

It is an arithmetic number, because the mean of its divisors is an integer number (5530536644040).

Almost surely, 2^{66077812607181} is an apocalyptic number.

It is an amenable number.

66077812607181 is a deficient number, since it is larger than the sum of its proper divisors (22410773697459).

66077812607181 is a wasteful number, since it uses less digits than its factorization.

66077812607181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53067796.

The product of its (nonzero) digits is 9483264, while the sum is 60.

The spelling of 66077812607181 in words is "sixty-six trillion, seventy-seven billion, eight hundred twelve million, six hundred seven thousand, one hundred eighty-one".