66576491436 has 384 divisors, whose sum is σ = 207186739200. Its totient is φ = 16164126720.

The previous prime is 66576491393. The next prime is 66576491437. The reversal of 66576491436 is 63419467566.

It is not an unprimeable number, because it can be changed into a prime (66576491437) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 71664220 + ... + 71665148.

It is an arithmetic number, because the mean of its divisors is an integer number (539548800).

Almost surely, 2^66576491436 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 66576491436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103593369600).

66576491436 is an abundant number, since it is smaller than the sum of its proper divisors (140610247764).

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

66576491436 is a wasteful number, since it uses less digits than its factorization.

66576491436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1087 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 57.

The spelling of 66576491436 in words is "sixty-six billion, five hundred seventy-six million, four hundred ninety-one thousand, four hundred thirty-six".