15606051105661 has 16 divisors (see below), whose sum is σ = 16066562642928. Its totient is φ = 15149517926400.

The previous prime is 15606051105653. The next prime is 15606051105683. The reversal of 15606051105661 is 16650115060651.

It can be written as a sum of positive squares in 8 ways, for example, as 9389536135225 + 6216514970436 = 3064235^2 + 2493294^2 .

It is a cyclic number.

It is not a de Polignac number, because 15606051105661 - 2³ = 15606051105653 is a prime.

It is a super-2 number, since 2×15606051105661² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15606051105611) 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 in 15 ways as a sum of consecutive naturals, for example, 6056341 + ... + 8239621.

It is an arithmetic number, because the mean of its divisors is an integer number (1004160165183).

Almost surely, 2^{15606051105661} is an apocalyptic number.

It is an amenable number.

15606051105661 is a deficient number, since it is larger than the sum of its proper divisors (460511537267).

15606051105661 is a wasteful number, since it uses less digits than its factorization.

15606051105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184192.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 15606051105661 in words is "fifteen trillion, six hundred six billion, fifty-one million, one hundred five thousand, six hundred sixty-one".