2195028823861 has 2 divisors, whose sum is σ = 2195028823862. Its totient is φ = 2195028823860.

The previous prime is 2195028823783. The next prime is 2195028823943. The reversal of 2195028823861 is 1683288205912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2194528183236 + 500640625 = 1481394^2 + 22375^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195028823861 - 2¹³ = 2195028815669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195028823261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097514411930 + 1097514411931.

It is an arithmetic number, because the mean of its divisors is an integer number (1097514411931).

Almost surely, 2^{2195028823861} is an apocalyptic number.

It is an amenable number.

2195028823861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195028823861 is an equidigital number, since it uses as much as digits as its factorization.

2195028823861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 2195028823861 in words is "two trillion, one hundred ninety-five billion, twenty-eight million, eight hundred twenty-three thousand, eight hundred sixty-one".