15744145868 has 36 divisors (see below), whose sum is σ = 30856170240. Its totient is φ = 7021391520.

The previous prime is 15744145867. The next prime is 15744145871. The reversal of 15744145868 is 86854144751.

It is a happy number.

It is a super-2 number, since 2×15744145868² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (15744145867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 281228 + ... + 332531.

It is an arithmetic number, because the mean of its divisors is an integer number (857115840).

Almost surely, 2^15744145868 is an apocalyptic number.

It is an amenable number.

15744145868 is a deficient number, since it is larger than the sum of its proper divisors (15112024372).

15744145868 is a wasteful number, since it uses less digits than its factorization.

15744145868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613838 (or 613825 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 53.

The spelling of 15744145868 in words is "fifteen billion, seven hundred forty-four million, one hundred forty-five thousand, eight hundred sixty-eight".