15644133340 has 48 divisors (see below), whose sum is σ = 35853156864. Its totient is φ = 5686574400.

The previous prime is 15644133311. The next prime is 15644133343. The reversal of 15644133340 is 4333144651.

It is a junction number, because it is equal to n+sod(n) for n = 15644133296 and 15644133305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15644133343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622825 + ... + 647455.

It is an arithmetic number, because the mean of its divisors is an integer number (746940768).

Almost surely, 2^15644133340 is an apocalyptic number.

15644133340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15644133340 is an abundant number, since it is smaller than the sum of its proper divisors (20209023524).

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

15644133340 is a wasteful number, since it uses less digits than its factorization.

15644133340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27538 (or 27536 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 15644133340 its reverse (4333144651), we get a palindrome (19977277991).

The spelling of 15644133340 in words is "fifteen billion, six hundred forty-four million, one hundred thirty-three thousand, three hundred forty".