1279666221285 has 64 divisors (see below), whose sum is σ = 2262653263872. Its totient is φ = 614280877056.

The previous prime is 1279666221241. The next prime is 1279666221349. The reversal of 1279666221285 is 5821226669721.

It is not a de Polignac number, because 1279666221285 - 2⁶ = 1279666221221 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30283342 + ... + 30325568.

It is an arithmetic number, because the mean of its divisors is an integer number (35353957248).

Almost surely, 2^{1279666221285} is an apocalyptic number.

1279666221285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1279666221285 is a deficient number, since it is larger than the sum of its proper divisors (982987042587).

1279666221285 is a wasteful number, since it uses less digits than its factorization.

1279666221285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47442.

The product of its digits is 8709120, while the sum is 57.

The spelling of 1279666221285 in words is "one trillion, two hundred seventy-nine billion, six hundred sixty-six million, two hundred twenty-one thousand, two hundred eighty-five".