1295866685921 has 16 divisors (see below), whose sum is σ = 1374912737280. Its totient is φ = 1217135185920.

The previous prime is 1295866685917. The next prime is 1295866685947.

1295866685921 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1295866685921 - 2² = 1295866685917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1295866684921) 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 15 ways as a sum of consecutive naturals, for example, 33242840 + ... + 33281798.

It is an arithmetic number, because the mean of its divisors is an integer number (85932046080).

Almost surely, 2^{1295866685921} is an apocalyptic number.

It is an amenable number.

1295866685921 is a deficient number, since it is larger than the sum of its proper divisors (79046051359).

1295866685921 is a wasteful number, since it uses less digits than its factorization.

1295866685921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42944.

The product of its digits is 111974400, while the sum is 68.

The spelling of 1295866685921 in words is "one trillion, two hundred ninety-five billion, eight hundred sixty-six million, six hundred eighty-five thousand, nine hundred twenty-one".