1276640271629 has 2 divisors, whose sum is σ = 1276640271630. Its totient is φ = 1276640271628.

The previous prime is 1276640271611. The next prime is 1276640271631. The reversal of 1276640271629 is 9261720466721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276640113225 + 158404 = 1129885^2 + 398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276640271629 - 2¹² = 1276640267533 is a prime.

Together with 1276640271631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276640271689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638320135814 + 638320135815.

It is an arithmetic number, because the mean of its divisors is an integer number (638320135815).

Almost surely, 2^{1276640271629} is an apocalyptic number.

It is an amenable number.

1276640271629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276640271629 is an equidigital number, since it uses as much as digits as its factorization.

1276640271629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 1276640271629 in words is "one trillion, two hundred seventy-six billion, six hundred forty million, two hundred seventy-one thousand, six hundred twenty-nine".