27991547944713 has 12 divisors (see below), whose sum is σ = 41826450952260. Its totient is φ = 18017548102176.

The previous prime is 27991547944697. The next prime is 27991547944729. The reversal of 27991547944713 is 31744974519972.

It is a happy number.

27991547944713 is a `hidden beast` number, since 2 + 7 + 9 + 9 + 1 + 547 + 9 + 4 + 4 + 71 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (27991547944697) and next prime (27991547944729).

It can be written as a sum of positive squares in 2 ways, for example, as 22182715281609 + 5808832663104 = 4709853^2 + 2410152^2 .

It is not a de Polignac number, because 27991547944713 - 2⁴ = 27991547944697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27991547948713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53623654806 + ... + 53623655327.

It is an arithmetic number, because the mean of its divisors is an integer number (3485537579355).

Almost surely, 2^{27991547944713} is an apocalyptic number.

It is an amenable number.

27991547944713 is a deficient number, since it is larger than the sum of its proper divisors (13834903007547).

27991547944713 is a wasteful number, since it uses less digits than its factorization.

27991547944713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107247310168 (or 107247310165 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 27991547944713 in words is "twenty-seven trillion, nine hundred ninety-one billion, five hundred forty-seven million, nine hundred forty-four thousand, seven hundred thirteen".