6921255592849 has 4 divisors (see below), whose sum is σ = 7453659869236. Its totient is φ = 6388851316464.

The previous prime is 6921255592799. The next prime is 6921255592871. The reversal of 6921255592849 is 9482955521296.

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 2345164520449 + 4576091072400 = 1531393^2 + 2139180^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921255592849 - 2¹¹ = 6921255590801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921255592879) 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, 266202138174 + ... + 266202138199.

It is an arithmetic number, because the mean of its divisors is an integer number (1863414967309).

Almost surely, 2^{6921255592849} is an apocalyptic number.

It is an amenable number.

6921255592849 is a deficient number, since it is larger than the sum of its proper divisors (532404276387).

6921255592849 is a wasteful number, since it uses less digits than its factorization.

6921255592849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532404276386.

The product of its digits is 139968000, while the sum is 67.

The spelling of 6921255592849 in words is "six trillion, nine hundred twenty-one billion, two hundred fifty-five million, five hundred ninety-two thousand, eight hundred forty-nine".