66797581824 has 560 divisors, whose sum is σ = 216400149504. Its totient is φ = 20528640000.

The previous prime is 66797581817. The next prime is 66797581831. The reversal of 66797581824 is 42818579766.

It is an interprime number because it is at equal distance from previous prime (66797581817) and next prime (66797581831).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 266125699 + ... + 266125949.

Almost surely, 2^66797581824 is an apocalyptic number.

66797581824 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 66797581824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108200074752).

66797581824 is an abundant number, since it is smaller than the sum of its proper divisors (149602567680).

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

66797581824 is an equidigital number, since it uses as much as digits as its factorization.

66797581824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 310 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 66797581824 in words is "sixty-six billion, seven hundred ninety-seven million, five hundred eighty-one thousand, eight hundred twenty-four".