66213701637 has 16 divisors (see below), whose sum is σ = 89541273600. Its totient is φ = 43514478000.

The previous prime is 66213701633. The next prime is 66213701647. The reversal of 66213701637 is 73610731266.

It is a happy number.

It is not a de Polignac number, because 66213701637 - 2² = 66213701633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66213701633) 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 15 ways as a sum of consecutive naturals, for example, 1813512 + ... + 1849662.

It is an arithmetic number, because the mean of its divisors is an integer number (5596329600).

Almost surely, 2^66213701637 is an apocalyptic number.

It is an amenable number.

66213701637 is a deficient number, since it is larger than the sum of its proper divisors (23327571963).

66213701637 is a wasteful number, since it uses less digits than its factorization.

66213701637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44824.

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 66213701637 in words is "sixty-six billion, two hundred thirteen million, seven hundred one thousand, six hundred thirty-seven".