7920640068133 has 4 divisors (see below), whose sum is σ = 8529920073388. Its totient is φ = 7311360062880.

The previous prime is 7920640067999. The next prime is 7920640068161. The reversal of 7920640068133 is 3318600460297.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4413436269124 + 3507203799009 = 2100818^2 + 1872753^2 .

It is a cyclic number.

It is not a de Polignac number, because 7920640068133 - 2⁹ = 7920640067621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920640065133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304640002608 + ... + 304640002633.

It is an arithmetic number, because the mean of its divisors is an integer number (2132480018347).

Almost surely, 2^{7920640068133} is an apocalyptic number.

It is an amenable number.

7920640068133 is a deficient number, since it is larger than the sum of its proper divisors (609280005255).

7920640068133 is a wasteful number, since it uses less digits than its factorization.

7920640068133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609280005254.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 7920640068133 in words is "seven trillion, nine hundred twenty billion, six hundred forty million, sixty-eight thousand, one hundred thirty-three".