2187394778347 has 2 divisors, whose sum is σ = 2187394778348. Its totient is φ = 2187394778346.

The previous prime is 2187394778279. The next prime is 2187394778383. The reversal of 2187394778347 is 7438774937812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2187394778347 is a prime.

It is a super-4 number, since 4×2187394778347⁴ (a number of 50 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (2187394779347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093697389173 + 1093697389174.

It is an arithmetic number, because the mean of its divisors is an integer number (1093697389174).

Almost surely, 2^{2187394778347} is an apocalyptic number.

2187394778347 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187394778347 is an equidigital number, since it uses as much as digits as its factorization.

2187394778347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 398297088, while the sum is 70.

The spelling of 2187394778347 in words is "two trillion, one hundred eighty-seven billion, three hundred ninety-four million, seven hundred seventy-eight thousand, three hundred forty-seven".