66649859137 has 16 divisors (see below), whose sum is σ = 72019168000. Its totient is φ = 61488595584.

The previous prime is 66649859119. The next prime is 66649859141. The reversal of 66649859137 is 73195894666.

It is a cyclic number.

It is not a de Polignac number, because 66649859137 - 2⁷ = 66649859009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66649854137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194562 + ... + 413707.

It is an arithmetic number, because the mean of its divisors is an integer number (4501198000).

Almost surely, 2^66649859137 is an apocalyptic number.

It is an amenable number.

66649859137 is a deficient number, since it is larger than the sum of its proper divisors (5369308863).

66649859137 is a wasteful number, since it uses less digits than its factorization.

66649859137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608440.

The product of its digits is 58786560, while the sum is 64.

The spelling of 66649859137 in words is "sixty-six billion, six hundred forty-nine million, eight hundred fifty-nine thousand, one hundred thirty-seven".