66291970128 has 40 divisors (see below), whose sum is σ = 171353863008. Its totient is φ = 22084470912.

The previous prime is 66291970127. The next prime is 66291970247. The reversal of 66291970128 is 82107919266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66291970127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318075 + ... + 483482.

Almost surely, 2^66291970128 is an apocalyptic number.

It is an amenable number.

66291970128 is an abundant number, since it is smaller than the sum of its proper divisors (105061892880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66291970128 is a wasteful number, since it uses less digits than its factorization.

66291970128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803291 (or 803285 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 66291970128 in words is "sixty-six billion, two hundred ninety-one million, nine hundred seventy thousand, one hundred twenty-eight".