15871471144 has 8 divisors (see below), whose sum is σ = 29759008410. Its totient is φ = 7935735568.

The previous prime is 15871471141. The next prime is 15871471151. The reversal of 15871471144 is 44117417851.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15690568644 + 180902500 = 125262^2 + 13450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 15871471144.

It is not an unprimeable number, because it can be changed into a prime (15871471141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991966939 + ... + 991966954.

Almost surely, 2^15871471144 is an apocalyptic number.

It is an amenable number.

15871471144 is a deficient number, since it is larger than the sum of its proper divisors (13887537266).

15871471144 is a wasteful number, since it uses less digits than its factorization.

15871471144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983933899 (or 1983933895 counting only the distinct ones).

The product of its digits is 125440, while the sum is 43.

Adding to 15871471144 its reverse (44117417851), we get a palindrome (59988888995).

The spelling of 15871471144 in words is "fifteen billion, eight hundred seventy-one million, four hundred seventy-one thousand, one hundred forty-four".