66080971584 has 140 divisors (see below), whose sum is σ = 196320370884. Its totient is φ = 21978003456.

The previous prime is 66080971559. The next prime is 66080971613. The reversal of 66080971584 is 48517908066.

It can be written as a sum of positive squares in 2 ways, for example, as 63467717184 + 2613254400 = 251928^2 + 51120^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 66080971584.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 2355142 + ... + 2383034.

Almost surely, 2^66080971584 is an apocalyptic number.

66080971584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66080971584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98160185442).

66080971584 is an abundant number, since it is smaller than the sum of its proper divisors (130239399300).

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

66080971584 is a wasteful number, since it uses less digits than its factorization.

66080971584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28374 (or 28355 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 66080971584 in words is "sixty-six billion, eighty million, nine hundred seventy-one thousand, five hundred eighty-four".