15990425400040 has 256 divisors, whose sum is σ = 44373547008000. Its totient is φ = 5050162197504.

The previous prime is 15990425400029. The next prime is 15990425400041. The reversal of 15990425400040 is 4000452409951.

It is a self number, because there is not a number n which added to its sum of digits gives 15990425400040.

It is not an unprimeable number, because it can be changed into a prime (15990425400041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6288015009 + ... + 6288017551.

It is an arithmetic number, because the mean of its divisors is an integer number (173334168000).

Almost surely, 2^{15990425400040} is an apocalyptic number.

15990425400040 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 15990425400040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22186773504000).

15990425400040 is an abundant number, since it is smaller than the sum of its proper divisors (28383121607960).

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

15990425400040 is a wasteful number, since it uses less digits than its factorization.

15990425400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5496 (or 5492 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

Adding to 15990425400040 its reverse (4000452409951), we get a palindrome (19990877809991).

The spelling of 15990425400040 in words is "fifteen trillion, nine hundred ninety billion, four hundred twenty-five million, four hundred thousand, forty".