1278567709412 has 24 divisors (see below), whose sum is σ = 2557279206720. Its totient is φ = 547926778080.

The previous prime is 1278567709399. The next prime is 1278567709427. The reversal of 1278567709412 is 2149077658721.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773414 + ... + 1776317.

It is an arithmetic number, because the mean of its divisors is an integer number (106553300280).

Almost surely, 2^{1278567709412} is an apocalyptic number.

It is an amenable number.

1278567709412 is an abundant number, since it is smaller than the sum of its proper divisors (1278711497308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278567709412 is a wasteful number, since it uses less digits than its factorization.

1278567709412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567651 (or 2567649 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 59.

The spelling of 1278567709412 in words is "one trillion, two hundred seventy-eight billion, five hundred sixty-seven million, seven hundred nine thousand, four hundred twelve".