66456226564 has 96 divisors (see below), whose sum is σ = 149779675136. Its totient is φ = 25093463040.

The previous prime is 66456226553. The next prime is 66456226567. The reversal of 66456226564 is 46562265466.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (66456226567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 783394 + ... + 864070.

Almost surely, 2^66456226564 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 66456226564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74889837568).

66456226564 is an abundant number, since it is smaller than the sum of its proper divisors (83323448572).

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

66456226564 is a wasteful number, since it uses less digits than its factorization.

66456226564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80805 (or 80803 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 52.

The spelling of 66456226564 in words is "sixty-six billion, four hundred fifty-six million, two hundred twenty-six thousand, five hundred sixty-four".