66271197861 has 24 divisors (see below), whose sum is σ = 105685515936. Its totient is φ = 39680449440.

The previous prime is 66271197859. The next prime is 66271197901. The reversal of 66271197861 is 16879117266.

66271197861 is a `hidden beast` number, since 6 + 627 + 1 + 1 + 9 + 7 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 66271197861 - 2¹ = 66271197859 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66271197798 and 66271197807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66271197841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4024350 + ... + 4040783.

It is an arithmetic number, because the mean of its divisors is an integer number (4403563164).

Almost surely, 2^66271197861 is an apocalyptic number.

It is an amenable number.

66271197861 is a deficient number, since it is larger than the sum of its proper divisors (39414318075).

66271197861 is a wasteful number, since it uses less digits than its factorization.

66271197861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065233 (or 8065230 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 66271197861 in words is "sixty-six billion, two hundred seventy-one million, one hundred ninety-seven thousand, eight hundred sixty-one".