1276561705643 has 24 divisors (see below), whose sum is σ = 1514215763424. Its totient is φ = 1072823875200.

The previous prime is 1276561705631. The next prime is 1276561705649. The reversal of 1276561705643 is 3465071656721.

It is not a de Polignac number, because 1276561705643 - 2¹⁸ = 1276561443499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1276561705649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383930 + ... + 1643327.

It is an arithmetic number, because the mean of its divisors is an integer number (63092323476).

Almost surely, 2^{1276561705643} is an apocalyptic number.

1276561705643 is a deficient number, since it is larger than the sum of its proper divisors (237654057781).

1276561705643 is a wasteful number, since it uses less digits than its factorization.

1276561705643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027523 (or 2027516 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 1276561705643 in words is "one trillion, two hundred seventy-six billion, five hundred sixty-one million, seven hundred five thousand, six hundred forty-three".