15861339648 has 400 divisors, whose sum is σ = 59035578624. Its totient is φ = 4118999040.

The previous prime is 15861339647. The next prime is 15861339653. The reversal of 15861339648 is 84693316851.

15861339648 is a `hidden beast` number, since 1 + 586 + 13 + 3 + 9 + 6 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 15861339594 and 15861339603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15861339647) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3190861 + ... + 3195827.

Almost surely, 2^15861339648 is an apocalyptic number.

15861339648 is a gapful number since it is divisible by the number (18) 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 15861339648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29517789312).

15861339648 is an abundant number, since it is smaller than the sum of its proper divisors (43174238976).

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

15861339648 is an equidigital number, since it uses as much as digits as its factorization.

15861339648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015 (or 4990 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 15861339648 in words is "fifteen billion, eight hundred sixty-one million, three hundred thirty-nine thousand, six hundred forty-eight".