2185640423237 has 2 divisors, whose sum is σ = 2185640423238. Its totient is φ = 2185640423236.

The previous prime is 2185640423179. The next prime is 2185640423249. The reversal of 2185640423237 is 7323240465812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2180935286401 + 4705136836 = 1476799^2 + 68594^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185640423237 - 2⁶ = 2185640423173 is a prime.

It is a super-2 number, since 2×2185640423237² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2185640423191 and 2185640423200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185640420237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092820211618 + 1092820211619.

It is an arithmetic number, because the mean of its divisors is an integer number (1092820211619).

Almost surely, 2^{2185640423237} is an apocalyptic number.

It is an amenable number.

2185640423237 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185640423237 is an equidigital number, since it uses as much as digits as its factorization.

2185640423237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 47.

The spelling of 2185640423237 in words is "two trillion, one hundred eighty-five billion, six hundred forty million, four hundred twenty-three thousand, two hundred thirty-seven".