16556132130661 has 8 divisors (see below), whose sum is σ = 17770159548504. Its totient is φ = 15368786634240.

The previous prime is 16556132130619. The next prime is 16556132130689. The reversal of 16556132130661 is 16603123165561.

It can be written as a sum of positive squares in 4 ways, for example, as 7092202808161 + 9463929322500 = 2663119^2 + 3076350^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16556132130661 - 2³³ = 16547542196069 is a prime.

It is a super-2 number, since 2×16556132130661² (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 (16556132130761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6670479070 + ... + 6670481551.

It is an arithmetic number, because the mean of its divisors is an integer number (2221269943563).

Almost surely, 2^{16556132130661} is an apocalyptic number.

It is an amenable number.

16556132130661 is a deficient number, since it is larger than the sum of its proper divisors (1214027417843).

16556132130661 is a wasteful number, since it uses less digits than its factorization.

16556132130661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13340960711.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 16556132130661 in words is "sixteen trillion, five hundred fifty-six billion, one hundred thirty-two million, one hundred thirty thousand, six hundred sixty-one".