15986485440 has 168 divisors, whose sum is σ = 55407903408. Its totient is φ = 4230420480.

The previous prime is 15986485429. The next prime is 15986485441. The reversal of 15986485440 is 4458468951.

15986485440 is a `hidden beast` number, since 1 + 5 + 98 + 6 + 4 + 8 + 544 + 0 = 666.

15986485440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (15986485441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356094 + ... + 398466.

Almost surely, 2^15986485440 is an apocalyptic number.

15986485440 is a gapful number since it is divisible by the number (10) 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 15986485440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27703951704).

15986485440 is an abundant number, since it is smaller than the sum of its proper divisors (39421417968).

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

15986485440 is a wasteful number, since it uses less digits than its factorization.

15986485440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42527 (or 42514 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 15986485440 in words is "fifteen billion, nine hundred eighty-six million, four hundred eighty-five thousand, four hundred forty".