15661342140 has 96 divisors (see below), whose sum is σ = 46466784000. Its totient is φ = 3927684096.

The previous prime is 15661342133. The next prime is 15661342141. The reversal of 15661342140 is 4124316651.

It is a super-2 number, since 2×15661342140² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661342141) 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, 1523859 + ... + 1534101.

It is an arithmetic number, because the mean of its divisors is an integer number (484029000).

Almost surely, 2^15661342140 is an apocalyptic number.

15661342140 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 15661342140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23233392000).

15661342140 is an abundant number, since it is smaller than the sum of its proper divisors (30805441860).

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

15661342140 is a wasteful number, since it uses less digits than its factorization.

15661342140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11771 (or 11769 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 15661342140 its reverse (4124316651), we get a palindrome (19785658791).

The spelling of 15661342140 in words is "fifteen billion, six hundred sixty-one million, three hundred forty-two thousand, one hundred forty".