66044169936 has 160 divisors (see below), whose sum is σ = 199689600000. Its totient is φ = 20841328512.

The previous prime is 66044169913. The next prime is 66044169943. The reversal of 66044169936 is 63996144066.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22020565 + ... + 22023563.

It is an arithmetic number, because the mean of its divisors is an integer number (1248060000).

Almost surely, 2^66044169936 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 66044169936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99844800000).

66044169936 is an abundant number, since it is smaller than the sum of its proper divisors (133645430064).

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

66044169936 is a wasteful number, since it uses less digits than its factorization.

66044169936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718 (or 5706 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The spelling of 66044169936 in words is "sixty-six billion, forty-four million, one hundred sixty-nine thousand, nine hundred thirty-six".