1279266861947 has 2 divisors, whose sum is σ = 1279266861948. Its totient is φ = 1279266861946.

The previous prime is 1279266861863. The next prime is 1279266862001. The reversal of 1279266861947 is 7491686629721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1279266861947 - 2¹⁶ = 1279266796411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279266860947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639633430973 + 639633430974.

It is an arithmetic number, because the mean of its divisors is an integer number (639633430974).

Almost surely, 2^{1279266861947} is an apocalyptic number.

1279266861947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279266861947 is an equidigital number, since it uses as much as digits as its factorization.

1279266861947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109734912, while the sum is 68.

The spelling of 1279266861947 in words is "one trillion, two hundred seventy-nine billion, two hundred sixty-six million, eight hundred sixty-one thousand, nine hundred forty-seven".