6181284721355 has 4 divisors (see below), whose sum is σ = 7417541665632. Its totient is φ = 4945027777080.

The previous prime is 6181284721343. The next prime is 6181284721357. The reversal of 6181284721355 is 5531274821816.

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

It is a de Polignac number, because none of the positive numbers 2^k-6181284721355 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6181284721297 and 6181284721306.

It is not an unprimeable number, because it can be changed into a prime (6181284721357) 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, 618128472131 + ... + 618128472140.

It is an arithmetic number, because the mean of its divisors is an integer number (1854385416408).

Almost surely, 2^{6181284721355} is an apocalyptic number.

6181284721355 is a deficient number, since it is larger than the sum of its proper divisors (1236256944277).

6181284721355 is a wasteful number, since it uses less digits than its factorization.

6181284721355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236256944276.

The product of its digits is 3225600, while the sum is 53.

The spelling of 6181284721355 in words is "six trillion, one hundred eighty-one billion, two hundred eighty-four million, seven hundred twenty-one thousand, three hundred fifty-five".