15644146644 has 72 divisors (see below), whose sum is σ = 45299374848. Its totient is φ = 4459354560.

The previous prime is 15644146627. The next prime is 15644146649. The reversal of 15644146644 is 44664144651.

15644146644 is a `hidden beast` number, since 1 + 564 + 4 + 1 + 46 + 6 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 15644146644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15644146649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36594 + ... + 180630.

It is an arithmetic number, because the mean of its divisors is an integer number (629157984).

Almost surely, 2^15644146644 is an apocalyptic number.

15644146644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15644146644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22649687424).

15644146644 is an abundant number, since it is smaller than the sum of its proper divisors (29655228204).

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

15644146644 is a wasteful number, since it uses less digits than its factorization.

15644146644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144485 (or 144480 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The spelling of 15644146644 in words is "fifteen billion, six hundred forty-four million, one hundred forty-six thousand, six hundred forty-four".