16525706661 has 12 divisors (see below), whose sum is σ = 23873546892. Its totient is φ = 11015715456.

The previous prime is 16525706623. The next prime is 16525706669. The reversal of 16525706661 is 16660752561.

It can be written as a sum of positive squares in 2 ways, for example, as 11512217025 + 5013489636 = 107295^2 + 70806^2 .

It is not a de Polignac number, because 16525706661 - 2¹⁵ = 16525673893 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16525706669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42366 + ... + 186671.

It is an arithmetic number, because the mean of its divisors is an integer number (1989462241).

Almost surely, 2^16525706661 is an apocalyptic number.

It is an amenable number.

16525706661 is a deficient number, since it is larger than the sum of its proper divisors (7347840231).

16525706661 is a wasteful number, since it uses less digits than its factorization.

16525706661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237060 (or 237057 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 16525706661 in words is "sixteen billion, five hundred twenty-five million, seven hundred six thousand, six hundred sixty-one".