1279139664000 has 512 divisors, whose sum is σ = 4827003217920. Its totient is φ = 296609280000.

The previous prime is 1279139663983. The next prime is 1279139664007. The reversal of 1279139664000 is 4669319721.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1279139664007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12091335 + ... + 12196665.

It is an arithmetic number, because the mean of its divisors is an integer number (9427740660).

Almost surely, 2^{1279139664000} is an apocalyptic number.

1279139664000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279139664000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2413501608960).

1279139664000 is an abundant number, since it is smaller than the sum of its proper divisors (3547863553920).

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

1279139664000 is a wasteful number, since it uses less digits than its factorization.

1279139664000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105397 (or 105375 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 1279139664000 in words is "one trillion, two hundred seventy-nine billion, one hundred thirty-nine million, six hundred sixty-four thousand".