15897775488 has 256 divisors, whose sum is σ = 51420925440. Its totient is φ = 4248207360.

The previous prime is 15897775483. The next prime is 15897775489. The reversal of 15897775488 is 88457779851.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15897775483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7904403 + ... + 7906413.

It is an arithmetic number, because the mean of its divisors is an integer number (200862990).

Almost surely, 2^15897775488 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 15897775488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25710462720).

15897775488 is an abundant number, since it is smaller than the sum of its proper divisors (35523149952).

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

15897775488 is a wasteful number, since it uses less digits than its factorization.

15897775488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225 (or 2213 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 69.

The spelling of 15897775488 in words is "fifteen billion, eight hundred ninety-seven million, seven hundred seventy-five thousand, four hundred eighty-eight".