1279948243577 has 2 divisors, whose sum is σ = 1279948243578. Its totient is φ = 1279948243576.

The previous prime is 1279948243547. The next prime is 1279948243583. The reversal of 1279948243577 is 7753428499721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870916366441 + 409031877136 = 933229^2 + 639556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279948243577 - 2²⁰ = 1279947195001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279948243507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639974121788 + 639974121789.

It is an arithmetic number, because the mean of its divisors is an integer number (639974121789).

Almost surely, 2^{1279948243577} is an apocalyptic number.

It is an amenable number.

1279948243577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279948243577 is an equidigital number, since it uses as much as digits as its factorization.

1279948243577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 213373440, while the sum is 68.

The spelling of 1279948243577 in words is "one trillion, two hundred seventy-nine billion, nine hundred forty-eight million, two hundred forty-three thousand, five hundred seventy-seven".