1289949166956 has 12 divisors (see below), whose sum is σ = 3009881389592. Its totient is φ = 429983055648.

The previous prime is 1289949166951. The next prime is 1289949167021. The reversal of 1289949166956 is 6596619499821.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1289949166951) 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 3 ways as a sum of consecutive naturals, for example, 53747881945 + ... + 53747881968.

Almost surely, 2^{1289949166956} is an apocalyptic number.

It is an amenable number.

1289949166956 is an abundant number, since it is smaller than the sum of its proper divisors (1719932222636).

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

1289949166956 is a wasteful number, since it uses less digits than its factorization.

1289949166956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107495763920 (or 107495763918 counting only the distinct ones).

The product of its digits is 453496320, while the sum is 75.

The spelling of 1289949166956 in words is "one trillion, two hundred eighty-nine billion, nine hundred forty-nine million, one hundred sixty-six thousand, nine hundred fifty-six".