6437610778243 has 2 divisors, whose sum is σ = 6437610778244. Its totient is φ = 6437610778242.

The previous prime is 6437610778229. The next prime is 6437610778307. The reversal of 6437610778243 is 3428770167346.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6437610778243 - 2²⁵ = 6437577223811 is a prime.

It is not a weakly prime, because it can be changed into another prime (6437610778843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3218805389121 + 3218805389122.

It is an arithmetic number, because the mean of its divisors is an integer number (3218805389122).

Almost surely, 2^{6437610778243} is an apocalyptic number.

6437610778243 is a deficient number, since it is larger than the sum of its proper divisors (1).

6437610778243 is an equidigital number, since it uses as much as digits as its factorization.

6437610778243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28449792, while the sum is 58.

The spelling of 6437610778243 in words is "six trillion, four hundred thirty-seven billion, six hundred ten million, seven hundred seventy-eight thousand, two hundred forty-three".