1278146782506 has 32 divisors (see below), whose sum is σ = 2789637055488. Its totient is φ = 387184822640.

The previous prime is 1278146782499. The next prime is 1278146782621. The reversal of 1278146782506 is 6052876418721.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3114960 + ... + 3501323.

It is an arithmetic number, because the mean of its divisors is an integer number (87176157984).

Almost surely, 2^{1278146782506} is an apocalyptic number.

1278146782506 is an abundant number, since it is smaller than the sum of its proper divisors (1511490272982).

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

1278146782506 is a wasteful number, since it uses less digits than its factorization.

1278146782506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619226.

The product of its (nonzero) digits is 9031680, while the sum is 57.

The spelling of 1278146782506 in words is "one trillion, two hundred seventy-eight billion, one hundred forty-six million, seven hundred eighty-two thousand, five hundred six".