11644545066 has 128 divisors (see below), whose sum is σ = 30611865600. Its totient is φ = 2864548800.

The previous prime is 11644545061. The next prime is 11644545091. The reversal of 11644545066 is 66054544611.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11644545061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 664485 + ... + 681783.

It is an arithmetic number, because the mean of its divisors is an integer number (239155200).

Almost surely, 2^11644545066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11644545066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15305932800).

11644545066 is an abundant number, since it is smaller than the sum of its proper divisors (18967320534).

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

11644545066 is a wasteful number, since it uses less digits than its factorization.

11644545066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17400.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 11644545066 in words is "eleven billion, six hundred forty-four million, five hundred forty-five thousand, sixty-six".