66371571728 has 120 divisors (see below), whose sum is σ = 163401416640. Its totient is φ = 25825416960.

The previous prime is 66371571709. The next prime is 66371571737. The reversal of 66371571728 is 82717517366.

It is a self number, because there is not a number n which added to its sum of digits gives 66371571728.

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, 7230950 + ... + 7240122.

It is an arithmetic number, because the mean of its divisors is an integer number (1361678472).

Almost surely, 2^66371571728 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 66371571728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81700708320).

66371571728 is an abundant number, since it is smaller than the sum of its proper divisors (97029844912).

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

66371571728 is a wasteful number, since it uses less digits than its factorization.

66371571728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10045 (or 10032 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 53.

The spelling of 66371571728 in words is "sixty-six billion, three hundred seventy-one million, five hundred seventy-one thousand, seven hundred twenty-eight".