1280792193661 has 2 divisors, whose sum is σ = 1280792193662. Its totient is φ = 1280792193660.

The previous prime is 1280792193563. The next prime is 1280792193763. The reversal of 1280792193661 is 1663912970821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972184168036 + 308608025625 = 985994^2 + 555525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280792193661 - 2²³ = 1280783805053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280792196661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640396096830 + 640396096831.

It is an arithmetic number, because the mean of its divisors is an integer number (640396096831).

Almost surely, 2^{1280792193661} is an apocalyptic number.

It is an amenable number.

1280792193661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280792193661 is an equidigital number, since it uses as much as digits as its factorization.

1280792193661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 1280792193661 in words is "one trillion, two hundred eighty billion, seven hundred ninety-two million, one hundred ninety-three thousand, six hundred sixty-one".