66040021737 has 64 divisors (see below), whose sum is σ = 106122044160. Its totient is φ = 40427154432.

The previous prime is 66040021681. The next prime is 66040021753. The reversal of 66040021737 is 73712004066.

66040021737 is a `hidden beast` number, since 6 + 6 + 0 + 400 + 217 + 37 = 666.

It is not a de Polignac number, because 66040021737 - 2¹⁰ = 66040020713 is a prime.

It is a super-2 number, since 2×66040021737² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66040021337) 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 63 ways as a sum of consecutive naturals, for example, 27097683 + ... + 27100119.

It is an arithmetic number, because the mean of its divisors is an integer number (1658156940).

Almost surely, 2^66040021737 is an apocalyptic number.

It is an amenable number.

66040021737 is a deficient number, since it is larger than the sum of its proper divisors (40082022423).

66040021737 is a wasteful number, since it uses less digits than its factorization.

66040021737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879 (or 3873 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The spelling of 66040021737 in words is "sixty-six billion, forty million, twenty-one thousand, seven hundred thirty-seven".