66756591237 has 24 divisors (see below), whose sum is σ = 106880869632. Its totient is φ = 36916084800.

The previous prime is 66756591233. The next prime is 66756591359. The reversal of 66756591237 is 73219565766.

It is not a de Polignac number, because 66756591237 - 2² = 66756591233 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66756591233) 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 23 ways as a sum of consecutive naturals, for example, 7320064 + ... + 7329177.

It is an arithmetic number, because the mean of its divisors is an integer number (4453369568).

Almost surely, 2^66756591237 is an apocalyptic number.

It is an amenable number.

66756591237 is a deficient number, since it is larger than the sum of its proper divisors (40124278395).

66756591237 is a wasteful number, since it uses less digits than its factorization.

66756591237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14649289 (or 14649282 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 57.

The spelling of 66756591237 in words is "sixty-six billion, seven hundred fifty-six million, five hundred ninety-one thousand, two hundred thirty-seven".