66345578496 has 364 divisors, whose sum is σ = 210783852072. Its totient is φ = 20798373888.

The previous prime is 66345578489. The next prime is 66345578521. The reversal of 66345578496 is 69487554366.

66345578496 is a `hidden beast` number, since 6 + 6 + 34 + 557 + 8 + 49 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 50761075 + ... + 50762381.

Almost surely, 2^66345578496 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 66345578496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105391926036).

66345578496 is an abundant number, since it is smaller than the sum of its proper divisors (144438273576).

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

66345578496 is an equidigital number, since it uses as much as digits as its factorization.

66345578496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1329 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 63.

The spelling of 66345578496 in words is "sixty-six billion, three hundred forty-five million, five hundred seventy-eight thousand, four hundred ninety-six".