20465161013617 has 4 divisors (see below), whose sum is σ = 21668994014436. Its totient is φ = 19261328012800.

The previous prime is 20465161013573. The next prime is 20465161013729. The reversal of 20465161013617 is 71631016156402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8722093115761 + 11743067897856 = 2953319^2 + 3426816^2 .

It is a cyclic number.

It is not a de Polignac number, because 20465161013617 - 2³⁵ = 20430801275249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20465161013917) 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, 601916500384 + ... + 601916500417.

It is an arithmetic number, because the mean of its divisors is an integer number (5417248503609).

Almost surely, 2^{20465161013617} is an apocalyptic number.

It is an amenable number.

20465161013617 is a deficient number, since it is larger than the sum of its proper divisors (1203833000819).

20465161013617 is a wasteful number, since it uses less digits than its factorization.

20465161013617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203833000818.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 20465161013617 in words is "twenty trillion, four hundred sixty-five billion, one hundred sixty-one million, thirteen thousand, six hundred seventeen".