27205774381 has 2 divisors, whose sum is σ = 27205774382. Its totient is φ = 27205774380.

The previous prime is 27205774307. The next prime is 27205774429. The reversal of 27205774381 is 18347750272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20351590281 + 6854184100 = 142659^2 + 82790^2 .

It is a cyclic number.

It is not a de Polignac number, because 27205774381 - 2⁹ = 27205773869 is a prime.

It is a super-2 number, since 2×27205774381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27205774081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13602887190 + 13602887191.

It is an arithmetic number, because the mean of its divisors is an integer number (13602887191).

Almost surely, 2^27205774381 is an apocalyptic number.

It is an amenable number.

27205774381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27205774381 is an equidigital number, since it uses as much as digits as its factorization.

27205774381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658560, while the sum is 46.

The spelling of 27205774381 in words is "twenty-seven billion, two hundred five million, seven hundred seventy-four thousand, three hundred eighty-one".