20555272161 has 6 divisors (see below), whose sum is σ = 29690948690. Its totient is φ = 13703514768.

The previous prime is 20555272117. The next prime is 20555272187. The reversal of 20555272161 is 16127255502.

20555272161 is a `hidden beast` number, since 2 + 0 + 55 + 527 + 21 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17048263761 + 3507008400 = 130569^2 + 59220^2 .

It is not a de Polignac number, because 20555272161 - 2⁶ = 20555272097 is a prime.

It is a super-2 number, since 2×20555272161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555272561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1141959556 + ... + 1141959573.

Almost surely, 2^20555272161 is an apocalyptic number.

It is an amenable number.

20555272161 is a deficient number, since it is larger than the sum of its proper divisors (9135676529).

20555272161 is a wasteful number, since it uses less digits than its factorization.

20555272161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283919135 (or 2283919132 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 20555272161 in words is "twenty billion, five hundred fifty-five million, two hundred seventy-two thousand, one hundred sixty-one".