66572513280 has 1456 divisors, whose sum is σ = 300812836800. Its totient is φ = 14046068736.

The previous prime is 66572513261. The next prime is 66572513339. The reversal of 66572513280 is 8231527566.

66572513280 is a `hidden beast` number, since 6 + 6 + 57 + 2 + 513 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1456).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 5120962554 + ... + 5120962566.

Almost surely, 2^66572513280 is an apocalyptic number.

66572513280 is a gapful number since it is divisible by the number (60) 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 66572513280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150406418400).

66572513280 is an abundant number, since it is smaller than the sum of its proper divisors (234240323520).

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

66572513280 is an frugal number, since it uses more digits than its factorization.

66572513280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 66572513280 in words is "sixty-six billion, five hundred seventy-two million, five hundred thirteen thousand, two hundred eighty".