66906649180 has 72 divisors (see below), whose sum is σ = 164691361296. Its totient is φ = 22764268800.

The previous prime is 66906649133. The next prime is 66906649223. The reversal of 66906649180 is 8194660966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132201 + ... + 388960.

It is an arithmetic number, because the mean of its divisors is an integer number (2287380018).

Almost surely, 2^66906649180 is an apocalyptic number.

It is an amenable number.

66906649180 is an abundant number, since it is smaller than the sum of its proper divisors (97784712116).

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

66906649180 is a wasteful number, since it uses less digits than its factorization.

66906649180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521315 (or 521306 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 66906649180 in words is "sixty-six billion, nine hundred six million, six hundred forty-nine thousand, one hundred eighty".