15606121542 has 64 divisors (see below), whose sum is σ = 35949139200. Its totient is φ = 4466810880.

The previous prime is 15606121493. The next prime is 15606121549. The reversal of 15606121542 is 24512160651.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15606121549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404134 + ... + 441062.

It is an arithmetic number, because the mean of its divisors is an integer number (561705300).

Almost surely, 2^15606121542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15606121542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17974569600).

15606121542 is an abundant number, since it is smaller than the sum of its proper divisors (20343017658).

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

15606121542 is a wasteful number, since it uses less digits than its factorization.

15606121542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37301.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 15606121542 in words is "fifteen billion, six hundred six million, one hundred twenty-one thousand, five hundred forty-two".