66626632944 has 200 divisors, whose sum is σ = 207714895872. Its totient is φ = 20557722240.

The previous prime is 66626632937. The next prime is 66626632957. The reversal of 66626632944 is 44923662666.

It is a happy number.

66626632944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66626632944² (a number of 22 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 887997 + ... + 960099.

Almost surely, 2^66626632944 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 66626632944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103857447936).

66626632944 is an abundant number, since it is smaller than the sum of its proper divisors (141088262928).

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

66626632944 is a wasteful number, since it uses less digits than its factorization.

66626632944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72177 (or 72162 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 54.

The spelling of 66626632944 in words is "sixty-six billion, six hundred twenty-six million, six hundred thirty-two thousand, nine hundred forty-four".