2278651668493 has 2 divisors, whose sum is σ = 2278651668494. Its totient is φ = 2278651668492.

The previous prime is 2278651668451. The next prime is 2278651668529. The reversal of 2278651668493 is 3948661568722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1735007936809 + 543643731684 = 1317197^2 + 737322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2278651668493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278651668413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139325834246 + 1139325834247.

It is an arithmetic number, because the mean of its divisors is an integer number (1139325834247).

Almost surely, 2^{2278651668493} is an apocalyptic number.

It is an amenable number.

2278651668493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278651668493 is an equidigital number, since it uses as much as digits as its factorization.

2278651668493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 67.

The spelling of 2278651668493 in words is "two trillion, two hundred seventy-eight billion, six hundred fifty-one million, six hundred sixty-eight thousand, four hundred ninety-three".