1263161240879 has 4 divisors (see below), whose sum is σ = 1264746136584. Its totient is φ = 1261576345176.

The previous prime is 1263161240857. The next prime is 1263161240909. The reversal of 1263161240879 is 9780421613621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1263161240879 - 2²⁴ = 1263144463663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263161240819) 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, 792446657 + ... + 792448250.

It is an arithmetic number, because the mean of its divisors is an integer number (316186534146).

Almost surely, 2^{1263161240879} is an apocalyptic number.

1263161240879 is a deficient number, since it is larger than the sum of its proper divisors (1584895705).

1263161240879 is an equidigital number, since it uses as much as digits as its factorization.

1263161240879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584895704.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 1263161240879 in words is "one trillion, two hundred sixty-three billion, one hundred sixty-one million, two hundred forty thousand, eight hundred seventy-nine".