1279554159817 has 2 divisors, whose sum is σ = 1279554159818. Its totient is φ = 1279554159816.

The previous prime is 1279554159787. The next prime is 1279554159841. The reversal of 1279554159817 is 7189514559721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1001288414736 + 278265745081 = 1000644^2 + 527509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279554159817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279554159217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639777079908 + 639777079909.

It is an arithmetic number, because the mean of its divisors is an integer number (639777079909).

Almost surely, 2^{1279554159817} is an apocalyptic number.

It is an amenable number.

1279554159817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279554159817 is an equidigital number, since it uses as much as digits as its factorization.

1279554159817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752000, while the sum is 64.

The spelling of 1279554159817 in words is "one trillion, two hundred seventy-nine billion, five hundred fifty-four million, one hundred fifty-nine thousand, eight hundred seventeen".