66371977161 has 12 divisors (see below), whose sum is σ = 109566438592. Its totient is φ = 37926844056.

The previous prime is 66371977157. The next prime is 66371977187. The reversal of 66371977161 is 16177917366.

66371977161 is a `hidden beast` number, since 66 + 371 + 97 + 71 + 61 = 666.

It is not a de Polignac number, because 66371977161 - 2² = 66371977157 is a prime.

It is a super-3 number, since 3×66371977161³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66371977098 and 66371977107.

It is not an unprimeable number, because it can be changed into a prime (66371977121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526761661 + ... + 526761786.

Almost surely, 2^66371977161 is an apocalyptic number.

It is an amenable number.

66371977161 is a deficient number, since it is larger than the sum of its proper divisors (43194461431).

66371977161 is a wasteful number, since it uses less digits than its factorization.

66371977161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053523460 (or 1053523457 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The spelling of 66371977161 in words is "sixty-six billion, three hundred seventy-one million, nine hundred seventy-seven thousand, one hundred sixty-one".