1289256852642 has 16 divisors (see below), whose sum is σ = 2812924042272. Its totient is φ = 390683894720.

The previous prime is 1289256852617. The next prime is 1289256852677. The reversal of 1289256852642 is 2462586529821.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9767097303 + ... + 9767097434.

It is an arithmetic number, because the mean of its divisors is an integer number (175807752642).

Almost surely, 2^{1289256852642} is an apocalyptic number.

1289256852642 is an abundant number, since it is smaller than the sum of its proper divisors (1523667189630).

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

1289256852642 is a wasteful number, since it uses less digits than its factorization.

1289256852642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19534194753.

The product of its digits is 33177600, while the sum is 60.

The spelling of 1289256852642 in words is "one trillion, two hundred eighty-nine billion, two hundred fifty-six million, eight hundred fifty-two thousand, six hundred forty-two".