16202161709 has 4 divisors (see below), whose sum is σ = 16202703900. Its totient is φ = 16201619520.

The previous prime is 16202161673. The next prime is 16202161711. The reversal of 16202161709 is 90716120261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90716120261 = 13 ⋅6978163097.

It can be written as a sum of positive squares in 2 ways, for example, as 12667502500 + 3534659209 = 112550^2 + 59453^2 .

It is a cyclic number.

It is not a de Polignac number, because 16202161709 - 2⁸ = 16202161453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16202121709) 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, 223484 + ... + 286965.

It is an arithmetic number, because the mean of its divisors is an integer number (4050675975).

Almost surely, 2^16202161709 is an apocalyptic number.

It is an amenable number.

16202161709 is a deficient number, since it is larger than the sum of its proper divisors (542191).

16202161709 is an equidigital number, since it uses as much as digits as its factorization.

16202161709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542190.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 16202161709 in words is "sixteen billion, two hundred two million, one hundred sixty-one thousand, seven hundred nine".