15542121144 has 64 divisors (see below), whose sum is σ = 44618544000. Its totient is φ = 4461851520.

The previous prime is 15542121139. The next prime is 15542121149. The reversal of 15542121144 is 44112124551.

It is an interprime number because it is at equal distance from previous prime (15542121139) and next prime (15542121149).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15542121149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1544239 + ... + 1554270.

It is an arithmetic number, because the mean of its divisors is an integer number (697164750).

Almost surely, 2^15542121144 is an apocalyptic number.

It is an amenable number.

15542121144 is an abundant number, since it is smaller than the sum of its proper divisors (29076422856).

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

15542121144 is a wasteful number, since it uses less digits than its factorization.

15542121144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098548 (or 3098544 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

Adding to 15542121144 its reverse (44112124551), we get a palindrome (59654245695).

The spelling of 15542121144 in words is "fifteen billion, five hundred forty-two million, one hundred twenty-one thousand, one hundred forty-four".