20161860609 has 16 divisors (see below), whose sum is σ = 29823402240. Its totient is φ = 12012201360.

The previous prime is 20161860553. The next prime is 20161860637. The reversal of 20161860609 is 90606816102.

It is not a de Polignac number, because 20161860609 - 2¹² = 20161856513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20161860689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5175727 + ... + 5179620.

It is an arithmetic number, because the mean of its divisors is an integer number (1863962640).

Almost surely, 2^20161860609 is an apocalyptic number.

It is an amenable number.

20161860609 is a deficient number, since it is larger than the sum of its proper divisors (9661541631).

20161860609 is a wasteful number, since it uses less digits than its factorization.

20161860609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10355420.

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 20161860609 in words is "twenty billion, one hundred sixty-one million, eight hundred sixty thousand, six hundred nine".