1276742842991 has 8 divisors (see below), whose sum is σ = 1591783284864. Its totient is φ = 994864552920.

The previous prime is 1276742842967. The next prime is 1276742843011. The reversal of 1276742842991 is 1992482476721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1276742842991 - 2¹⁸ = 1276742580847 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 (1276742842931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8290537865 + ... + 8290538018.

It is an arithmetic number, because the mean of its divisors is an integer number (198972910608).

Almost surely, 2^{1276742842991} is an apocalyptic number.

1276742842991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1276742842991 is a deficient number, since it is larger than the sum of its proper divisors (315040441873).

1276742842991 is a wasteful number, since it uses less digits than its factorization.

1276742842991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16581075901.

The product of its digits is 24385536, while the sum is 62.

The spelling of 1276742842991 in words is "one trillion, two hundred seventy-six billion, seven hundred forty-two million, eight hundred forty-two thousand, nine hundred ninety-one".