66553909704 has 192 divisors, whose sum is σ = 192507494400. Its totient is φ = 20723395968.

The previous prime is 66553909679. The next prime is 66553909711. The reversal of 66553909704 is 40790935566.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64055217 + ... + 64056255.

It is an arithmetic number, because the mean of its divisors is an integer number (1002643200).

Almost surely, 2^66553909704 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 66553909704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96253747200).

66553909704 is an abundant number, since it is smaller than the sum of its proper divisors (125953584696).

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

66553909704 is a wasteful number, since it uses less digits than its factorization.

66553909704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 54.

The spelling of 66553909704 in words is "sixty-six billion, five hundred fifty-three million, nine hundred nine thousand, seven hundred four".