16658851061 has 4 divisors (see below), whose sum is σ = 16780448652. Its totient is φ = 16537253472.

The previous prime is 16658851051. The next prime is 16658851109. The reversal of 16658851061 is 16015885661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16015885661 = 139 ⋅115222199.

It can be written as a sum of positive squares in 2 ways, for example, as 8363102500 + 8295748561 = 91450^2 + 91081^2 .

It is a cyclic number.

It is not a de Polignac number, because 16658851061 - 2¹⁸ = 16658588917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16658850997 and 16658851015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16658851051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60798590 + ... + 60798863.

It is an arithmetic number, because the mean of its divisors is an integer number (4195112163).

Almost surely, 2^16658851061 is an apocalyptic number.

It is an amenable number.

16658851061 is a deficient number, since it is larger than the sum of its proper divisors (121597591).

16658851061 is a wasteful number, since it uses less digits than its factorization.

16658851061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121597590.

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 16658851061 in words is "sixteen billion, six hundred fifty-eight million, eight hundred fifty-one thousand, sixty-one".