Search a number
-
+
21637968665563 is a prime number
BaseRepresentation
bin1001110101101111110110…
…11011111001101111011011
32211121120101020111001010201
410322313323123321233123
510314004024434244223
6114004202351123031
74362202014660625
oct472677333715733
984546336431121
1021637968665563
11699267a235978
1225156bbb13477
13c0c5b4493793
1454b3d7421c15
15277cbe94eead
hex13adfb6f9bdb

21637968665563 has 2 divisors, whose sum is σ = 21637968665564. Its totient is φ = 21637968665562.

The previous prime is 21637968665557. The next prime is 21637968665591. The reversal of 21637968665563 is 36556686973612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21637968665563 - 241 = 19438945410011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21637968665543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10818984332781 + 10818984332782.

It is an arithmetic number, because the mean of its divisors is an integer number (10818984332782).

Almost surely, 221637968665563 is an apocalyptic number.

21637968665563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21637968665563 is an equidigital number, since it uses as much as digits as its factorization.

21637968665563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1763596800, while the sum is 73.

The spelling of 21637968665563 in words is "twenty-one trillion, six hundred thirty-seven billion, nine hundred sixty-eight million, six hundred sixty-five thousand, five hundred sixty-three".