66225578844 has 24 divisors (see below), whose sum is σ = 154545341328. Its totient is φ = 22072480000.

The previous prime is 66225578827. The next prime is 66225578849. The reversal of 66225578844 is 44887552266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66225578849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236157 + ... + 433844.

It is an arithmetic number, because the mean of its divisors is an integer number (6439389222).

Almost surely, 2^66225578844 is an apocalyptic number.

It is an amenable number.

66225578844 is an abundant number, since it is smaller than the sum of its proper divisors (88319762484).

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

66225578844 is a wasteful number, since it uses less digits than its factorization.

66225578844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678245 (or 678243 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 57.

The spelling of 66225578844 in words is "sixty-six billion, two hundred twenty-five million, five hundred seventy-eight thousand, eight hundred forty-four".