275621378381 has 2 divisors, whose sum is σ = 275621378382. Its totient is φ = 275621378380.

The previous prime is 275621378377. The next prime is 275621378387. The reversal of 275621378381 is 183873126572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246546013156 + 29075365225 = 496534^2 + 170515^2 .

It is a cyclic number.

It is not a de Polignac number, because 275621378381 - 2² = 275621378377 is a prime.

It is a super-2 number, since 2×275621378381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275621378387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137810689190 + 137810689191.

It is an arithmetic number, because the mean of its divisors is an integer number (137810689191).

Almost surely, 2^275621378381 is an apocalyptic number.

It is an amenable number.

275621378381 is a deficient number, since it is larger than the sum of its proper divisors (1).

275621378381 is an equidigital number, since it uses as much as digits as its factorization.

275621378381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The spelling of 275621378381 in words is "two hundred seventy-five billion, six hundred twenty-one million, three hundred seventy-eight thousand, three hundred eighty-one".