15998054252544 has 1680 divisors, whose sum is σ = 60649420688640. Its totient is φ = 4104891924480.

The previous prime is 15998054252483. The next prime is 15998054252563. The reversal of 15998054252544 is 44525245089951.

It is a happy number.

15998054252544 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 80 + 5 + 4 + 2 + 5 + 2 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 111 ways as a sum of consecutive naturals, for example, 44562825037 + ... + 44562825395.

It is an arithmetic number, because the mean of its divisors is an integer number (36100845648).

Almost surely, 2^{15998054252544} is an apocalyptic number.

15998054252544 is a gapful number since it is divisible by the number (14) 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 15998054252544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30324710344320).

15998054252544 is an abundant number, since it is smaller than the sum of its proper divisors (44651366436096).

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

15998054252544 is an frugal number, since it uses more digits than its factorization.

15998054252544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 103680000, while the sum is 63.

The spelling of 15998054252544 in words is "fifteen trillion, nine hundred ninety-eight billion, fifty-four million, two hundred fifty-two thousand, five hundred forty-four".