66197530240 has 128 divisors (see below), whose sum is σ = 160352910720. Its totient is φ = 26130124800.

The previous prime is 66197530229. The next prime is 66197530271. The reversal of 66197530240 is 4203579166.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×66197530240² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15170299 + ... + 15174661.

It is an arithmetic number, because the mean of its divisors is an integer number (1252757115).

Almost surely, 2^66197530240 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 66197530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80176455360).

66197530240 is an abundant number, since it is smaller than the sum of its proper divisors (94155380480).

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

66197530240 is a wasteful number, since it uses less digits than its factorization.

66197530240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4690 (or 4678 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 66197530240 in words is "sixty-six billion, one hundred ninety-seven million, five hundred thirty thousand, two hundred forty".