20161602305 has 8 divisors (see below), whose sum is σ = 26054993832. Its totient is φ = 14888567808.

The previous prime is 20161602299. The next prime is 20161602311. The reversal of 20161602305 is 50320616102.

It is an interprime number because it is at equal distance from previous prime (20161602299) and next prime (20161602311).

It can be written as a sum of positive squares in 4 ways, for example, as 1269924496 + 18891677809 = 35636^2 + 137447^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20161602305 - 2⁸ = 20161602049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155089184 + ... + 155089313.

It is an arithmetic number, because the mean of its divisors is an integer number (3256874229).

Almost surely, 2^20161602305 is an apocalyptic number.

It is an amenable number.

20161602305 is a deficient number, since it is larger than the sum of its proper divisors (5893391527).

20161602305 is a wasteful number, since it uses less digits than its factorization.

20161602305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310178515.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 20161602305 in words is "twenty billion, one hundred sixty-one million, six hundred two thousand, three hundred five".