6921613350613 has 4 divisors (see below), whose sum is σ = 7454045146828. Its totient is φ = 6389181554400.

The previous prime is 6921613350607. The next prime is 6921613350623. The reversal of 6921613350613 is 3160533161296.

6921613350613 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 2408635712484 + 4512977638129 = 1551978^2 + 2124377^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921613350613 - 2¹³ = 6921613342421 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 (6921613350623) 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, 266215898088 + ... + 266215898113.

It is an arithmetic number, because the mean of its divisors is an integer number (1863511286707).

Almost surely, 2^{6921613350613} is an apocalyptic number.

It is an amenable number.

6921613350613 is a deficient number, since it is larger than the sum of its proper divisors (532431796215).

6921613350613 is a wasteful number, since it uses less digits than its factorization.

6921613350613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532431796214.

The product of its (nonzero) digits is 524880, while the sum is 46.

The spelling of 6921613350613 in words is "six trillion, nine hundred twenty-one billion, six hundred thirteen million, three hundred fifty thousand, six hundred thirteen".