2645478838381 has 2 divisors, whose sum is σ = 2645478838382. Its totient is φ = 2645478838380.

The previous prime is 2645478838309. The next prime is 2645478838391. The reversal of 2645478838381 is 1838388745462.

2645478838381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2536664621481 + 108814216900 = 1592691^2 + 329870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645478838381 - 2⁷ = 2645478838253 is a prime.

It is a super-2 number, since 2×2645478838381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645478838391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322739419190 + 1322739419191.

It is an arithmetic number, because the mean of its divisors is an integer number (1322739419191).

Almost surely, 2^{2645478838381} is an apocalyptic number.

It is an amenable number.

2645478838381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645478838381 is an equidigital number, since it uses as much as digits as its factorization.

2645478838381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 247726080, while the sum is 67.

The spelling of 2645478838381 in words is "two trillion, six hundred forty-five billion, four hundred seventy-eight million, eight hundred thirty-eight thousand, three hundred eighty-one".