15661106560552 has 8 divisors (see below), whose sum is σ = 29364574801050. Its totient is φ = 7830553280272.

The previous prime is 15661106560523. The next prime is 15661106560559. The reversal of 15661106560552 is 25506560116651.

It can be written as a sum of positive squares in only one way, i.e., 15650837980996 + 10268579556 = 3956114^2 + 101334^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 15661106560496 and 15661106560505.

It is not an unprimeable number, because it can be changed into a prime (15661106560559) 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 as a sum of consecutive naturals, namely, 978819160027 + ... + 978819160042.

Almost surely, 2^{15661106560552} is an apocalyptic number.

It is an amenable number.

15661106560552 is a deficient number, since it is larger than the sum of its proper divisors (13703468240498).

15661106560552 is a wasteful number, since it uses less digits than its factorization.

15661106560552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957638320075 (or 1957638320071 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 15661106560552 in words is "fifteen trillion, six hundred sixty-one billion, one hundred six million, five hundred sixty thousand, five hundred fifty-two".