201800894389961 has 2 divisors, whose sum is σ = 201800894389962. Its totient is φ = 201800894389960.

The previous prime is 201800894389891. The next prime is 201800894389979. The reversal of 201800894389961 is 169983498008102.

201800894389961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154803836796361 + 46997057593600 = 12442019^2 + 6855440^2 .

It is a cyclic number.

It is not a de Polignac number, because 201800894389961 - 2¹⁸ = 201800894127817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201800894389891 and 201800894389900.

It is not a weakly prime, because it can be changed into another prime (201800894382961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100900447194980 + 100900447194981.

It is an arithmetic number, because the mean of its divisors is an integer number (100900447194981).

Almost surely, 2^{201800894389961} is an apocalyptic number.

It is an amenable number.

201800894389961 is a deficient number, since it is larger than the sum of its proper divisors (1).

201800894389961 is an equidigital number, since it uses as much as digits as its factorization.

201800894389961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53747712, while the sum is 68.

The spelling of 201800894389961 in words is "two hundred one trillion, eight hundred billion, eight hundred ninety-four million, three hundred eighty-nine thousand, nine hundred sixty-one".