20801561361275 has 12 divisors (see below), whose sum is σ = 25794018841272. Its totient is φ = 16641195699840.

The previous prime is 20801561361263. The next prime is 20801561361277. The reversal of 20801561361275 is 57216316510802.

It is not a de Polignac number, because 20801561361275 - 2³⁰ = 20800487619451 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20801561361277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7853864 + ... + 10162986.

It is an arithmetic number, because the mean of its divisors is an integer number (2149501570106).

Almost surely, 2^{20801561361275} is an apocalyptic number.

20801561361275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20801561361275 is a deficient number, since it is larger than the sum of its proper divisors (4992457479997).

20801561361275 is a wasteful number, since it uses less digits than its factorization.

20801561361275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669470 (or 2669465 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 20801561361275 in words is "twenty trillion, eight hundred one billion, five hundred sixty-one million, three hundred sixty-one thousand, two hundred seventy-five".