66181570560 has 896 divisors, whose sum is σ = 274794024960. Its totient is φ = 14799863808.

The previous prime is 66181570549. The next prime is 66181570577. The reversal of 66181570560 is 6507518166.

66181570560 is a `hidden beast` number, since 6 + 6 + 1 + 8 + 15 + 70 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 642539469 + ... + 642539571.

It is an arithmetic number, because the mean of its divisors is an integer number (306689760).

Almost surely, 2^66181570560 is an apocalyptic number.

66181570560 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 66181570560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137397012480).

66181570560 is an abundant number, since it is smaller than the sum of its proper divisors (208612454400).

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

66181570560 is a wasteful number, since it uses less digits than its factorization.

66181570560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 66181570560 in words is "sixty-six billion, one hundred eighty-one million, five hundred seventy thousand, five hundred sixty".