16709417661 has 4 divisors (see below), whose sum is σ = 22279223552. Its totient is φ = 11139611772.

The previous prime is 16709417639. The next prime is 16709417713. The reversal of 16709417661 is 16671490761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16671490761 = 3 ⋅5557163587.

It is not a de Polignac number, because 16709417661 - 2⁷ = 16709417533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16709417661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16709417161) 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, 2784902941 + ... + 2784902946.

It is an arithmetic number, because the mean of its divisors is an integer number (5569805888).

Almost surely, 2^16709417661 is an apocalyptic number.

It is an amenable number.

16709417661 is a deficient number, since it is larger than the sum of its proper divisors (5569805891).

16709417661 is an equidigital number, since it uses as much as digits as its factorization.

16709417661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569805890.

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 16709417661 in words is "sixteen billion, seven hundred nine million, four hundred seventeen thousand, six hundred sixty-one".