66373063281 has 32 divisors (see below), whose sum is σ = 112419993600. Its totient is φ = 37913181840.

The previous prime is 66373063279. The next prime is 66373063301. The reversal of 66373063281 is 18236037366.

66373063281 is a `hidden beast` number, since 6 + 6 + 3 + 7 + 3 + 0 + 632 + 8 + 1 = 666.

It is not a de Polignac number, because 66373063281 - 2¹ = 66373063279 is a prime.

It is a super-2 number, since 2×66373063281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66373063231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447610 + ... + 577148.

It is an arithmetic number, because the mean of its divisors is an integer number (3513124800).

Almost surely, 2^66373063281 is an apocalyptic number.

It is an amenable number.

66373063281 is a deficient number, since it is larger than the sum of its proper divisors (46046930319).

66373063281 is a wasteful number, since it uses less digits than its factorization.

66373063281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132266 (or 132260 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 66373063281 in words is "sixty-six billion, three hundred seventy-three million, sixty-three thousand, two hundred eighty-one".