66149028992 has 72 divisors (see below), whose sum is σ = 133573283235. Its totient is φ = 32630766336.

The previous prime is 66149028983. The next prime is 66149029061. The reversal of 66149028992 is 29982094166.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 33074514496 + 33074514496 = 181864^2 + 181864^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=181864.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 369547559 + ... + 369547737.

Almost surely, 2^66149028992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66149028992

66149028992 is an abundant number, since it is smaller than the sum of its proper divisors (67424254243).

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

66149028992 is an frugal number, since it uses more digits than its factorization.

66149028992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 66149028992 in words is "sixty-six billion, one hundred forty-nine million, twenty-eight thousand, nine hundred ninety-two".