1021275665613 has 24 divisors (see below), whose sum is σ = 1685941920000. Its totient is φ = 583576909344.

The previous prime is 1021275665611. The next prime is 1021275665639. The reversal of 1021275665613 is 3165665721201.

1021275665613 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 27 + 5 + 6 + 6 + 5 + 613 = 666.

It is not a de Polignac number, because 1021275665613 - 2¹ = 1021275665611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021275665611) 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 23 ways as a sum of consecutive naturals, for example, 7463788 + ... + 7599386.

It is an arithmetic number, because the mean of its divisors is an integer number (70247580000).

Almost surely, 2^{1021275665613} is an apocalyptic number.

It is an amenable number.

1021275665613 is a deficient number, since it is larger than the sum of its proper divisors (664666254387).

1021275665613 is a wasteful number, since it uses less digits than its factorization.

1021275665613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255161 (or 255158 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 1021275665613 in words is "one trillion, twenty-one billion, two hundred seventy-five million, six hundred sixty-five thousand, six hundred thirteen".