15540345340 has 96 divisors (see below), whose sum is σ = 36283617216. Its totient is φ = 5554483200.

The previous prime is 15540345259. The next prime is 15540345341. The reversal of 15540345340 is 4354304551.

It is a junction number, because it is equal to n+sod(n) for n = 15540345296 and 15540345305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540345341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1257190 + ... + 1269490.

It is an arithmetic number, because the mean of its divisors is an integer number (377954346).

Almost surely, 2^15540345340 is an apocalyptic number.

15540345340 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 15540345340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18141808608).

15540345340 is an abundant number, since it is smaller than the sum of its proper divisors (20743271876).

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

15540345340 is a wasteful number, since it uses less digits than its factorization.

15540345340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12479 (or 12477 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 15540345340 its reverse (4354304551), we get a palindrome (19894649891).

The spelling of 15540345340 in words is "fifteen billion, five hundred forty million, three hundred forty-five thousand, three hundred forty".