66439226112 has 288 divisors, whose sum is σ = 206941754880. Its totient is φ = 18530304000.

The previous prime is 66439226111. The next prime is 66439226123. The reversal of 66439226112 is 21162293466.

It is a super-2 number, since 2×66439226112² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (66439226111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71516464 + ... + 71517392.

It is an arithmetic number, because the mean of its divisors is an integer number (718547760).

Almost surely, 2^66439226112 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 66439226112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103470877440).

66439226112 is an abundant number, since it is smaller than the sum of its proper divisors (140502528768).

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

66439226112 is a wasteful number, since it uses less digits than its factorization.

66439226112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259 (or 1245 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The spelling of 66439226112 in words is "sixty-six billion, four hundred thirty-nine million, two hundred twenty-six thousand, one hundred twelve".