15542971890 has 64 divisors (see below), whose sum is σ = 38530114560. Its totient is φ = 4008625920.

The previous prime is 15542971849. The next prime is 15542971891. The reversal of 15542971890 is 9817924551.

It is not an unprimeable number, because it can be changed into a prime (15542971891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1882852 + ... + 1891088.

It is an arithmetic number, because the mean of its divisors is an integer number (602033040).

Almost surely, 2^15542971890 is an apocalyptic number.

15542971890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15542971890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19265057280).

15542971890 is an abundant number, since it is smaller than the sum of its proper divisors (22987142670).

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

15542971890 is a wasteful number, since it uses less digits than its factorization.

15542971890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10307.

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 15542971890 in words is "fifteen billion, five hundred forty-two million, nine hundred seventy-one thousand, eight hundred ninety".