66044696544 has 120 divisors (see below), whose sum is σ = 195043419648. Its totient is φ = 21923343360.

The previous prime is 66044696539. The next prime is 66044696551. The reversal of 66044696544 is 44569644066.

66044696544 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 4 + 6 + 96 + 544 = 666.

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 19 ways as a sum of consecutive naturals, for example, 571809 + ... + 677535.

Almost surely, 2^66044696544 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 66044696544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97521709824).

66044696544 is an abundant number, since it is smaller than the sum of its proper divisors (128998723104).

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

66044696544 is a wasteful number, since it uses less digits than its factorization.

66044696544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105990 (or 105973 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 54.

The spelling of 66044696544 in words is "sixty-six billion, forty-four million, six hundred ninety-six thousand, five hundred forty-four".