66209959376 has 40 divisors (see below), whose sum is σ = 147309247200. Its totient is φ = 28511464320.

The previous prime is 66209959373. The next prime is 66209959393. The reversal of 66209959376 is 67395990266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66209959373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9896471 + ... + 9903158.

It is an arithmetic number, because the mean of its divisors is an integer number (3682731180).

Almost surely, 2^66209959376 is an apocalyptic number.

It is an amenable number.

66209959376 is an abundant number, since it is smaller than the sum of its proper divisors (81099287824).

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

66209959376 is a wasteful number, since it uses less digits than its factorization.

66209959376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19799667 (or 19799661 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 62.

The spelling of 66209959376 in words is "sixty-six billion, two hundred nine million, nine hundred fifty-nine thousand, three hundred seventy-six".