15661556661060 has 36 divisors (see below), whose sum is σ = 47506721872428. Its totient is φ = 4176415109568.

The previous prime is 15661556660993. The next prime is 15661556661071. The reversal of 15661556661060 is 6016665516651.

It can be written as a sum of positive squares in 2 ways, for example, as 6000549958404 + 9661006702656 = 2449602^2 + 3108216^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 15661556660988 and 15661556661006.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43504323879 + ... + 43504324238.

It is an arithmetic number, because the mean of its divisors is an integer number (1319631163123).

Almost surely, 2^{15661556661060} is an apocalyptic number.

15661556661060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15661556661060 is an abundant number, since it is smaller than the sum of its proper divisors (31845165211368).

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

15661556661060 is a wasteful number, since it uses less digits than its factorization.

15661556661060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87008648132 (or 87008648127 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 15661556661060 in words is "fifteen trillion, six hundred sixty-one billion, five hundred fifty-six million, six hundred sixty-one thousand, sixty".