1279726923697 has 2 divisors, whose sum is σ = 1279726923698. Its totient is φ = 1279726923696.

The previous prime is 1279726923691. The next prime is 1279726923703. The reversal of 1279726923697 is 7963296279721.

It is a balanced prime because it is at equal distance from previous prime (1279726923691) and next prime (1279726923703).

It can be written as a sum of positive squares in only one way, i.e., 933125088256 + 346601835441 = 965984^2 + 588729^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279726923697 - 2¹⁹ = 1279726399409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279726923691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639863461848 + 639863461849.

It is an arithmetic number, because the mean of its divisors is an integer number (639863461849).

Almost surely, 2^{1279726923697} is an apocalyptic number.

It is an amenable number.

1279726923697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279726923697 is an equidigital number, since it uses as much as digits as its factorization.

1279726923697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216040608, while the sum is 70.

The spelling of 1279726923697 in words is "one trillion, two hundred seventy-nine billion, seven hundred twenty-six million, nine hundred twenty-three thousand, six hundred ninety-seven".