66588991488 has 112 divisors (see below), whose sum is σ = 197289328560. Its totient is φ = 22196256768.

The previous prime is 66588991439. The next prime is 66588991499. The reversal of 66588991488 is 88419988566.

66588991488 is a `hidden beast` number, since 6 + 6 + 58 + 8 + 9 + 91 + 488 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70656 + ... + 371712.

Almost surely, 2^66588991488 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 66588991488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98644664280).

66588991488 is an abundant number, since it is smaller than the sum of its proper divisors (130700337072).

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

66588991488 is an equidigital number, since it uses as much as digits as its factorization.

66588991488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301092 (or 301062 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 72.

The spelling of 66588991488 in words is "sixty-six billion, five hundred eighty-eight million, nine hundred ninety-one thousand, four hundred eighty-eight".