15966781560 has 192 divisors, whose sum is σ = 54421567200. Its totient is φ = 4209739776.

The previous prime is 15966781559. The next prime is 15966781619. The reversal of 15966781560 is 6518766951.

15966781560 is a `hidden beast` number, since 1 + 5 + 9 + 6 + 6 + 78 + 1 + 560 = 666.

It is a super-2 number, since 2×15966781560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 15966781497 and 15966781506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 855852 + ... + 874308.

Almost surely, 2^15966781560 is an apocalyptic number.

15966781560 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 15966781560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27210783600).

15966781560 is an abundant number, since it is smaller than the sum of its proper divisors (38454785640).

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

15966781560 is a wasteful number, since it uses less digits than its factorization.

15966781560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18572 (or 18556 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 15966781560 in words is "fifteen billion, nine hundred sixty-six million, seven hundred eighty-one thousand, five hundred sixty".