1279649671673 has 4 divisors (see below), whose sum is σ = 1306876260480. Its totient is φ = 1252423082868.

The previous prime is 1279649671667. The next prime is 1279649671679. The reversal of 1279649671673 is 3761769469721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1279649671667) and next prime (1279649671679).

It is a cyclic number.

It is not a de Polignac number, because 1279649671673 - 2¹² = 1279649667577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279649671679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13613294333 + ... + 13613294426.

It is an arithmetic number, because the mean of its divisors is an integer number (326719065120).

Almost surely, 2^{1279649671673} is an apocalyptic number.

It is an amenable number.

1279649671673 is a deficient number, since it is larger than the sum of its proper divisors (27226588807).

1279649671673 is an equidigital number, since it uses as much as digits as its factorization.

1279649671673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27226588806.

The product of its digits is 144027072, while the sum is 68.

The spelling of 1279649671673 in words is "one trillion, two hundred seventy-nine billion, six hundred forty-nine million, six hundred seventy-one thousand, six hundred seventy-three".