1278780298117 has 8 divisors (see below), whose sum is σ = 1461622802112. Its totient is φ = 1095977695200.

The previous prime is 1278780298111. The next prime is 1278780298141. The reversal of 1278780298117 is 7118920878721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278780298117 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 (1278780298111) 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, 9906559 + ... + 10034812.

It is an arithmetic number, because the mean of its divisors is an integer number (182702850264).

Almost surely, 2^{1278780298117} is an apocalyptic number.

It is an amenable number.

1278780298117 is a deficient number, since it is larger than the sum of its proper divisors (182842503995).

1278780298117 is an equidigital number, since it uses as much as digits as its factorization.

1278780298117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19950539.

The product of its (nonzero) digits is 6322176, while the sum is 61.

The spelling of 1278780298117 in words is "one trillion, two hundred seventy-eight billion, seven hundred eighty million, two hundred ninety-eight thousand, one hundred seventeen".