27481640509 has 2 divisors, whose sum is σ = 27481640510. Its totient is φ = 27481640508.

The previous prime is 27481640477. The next prime is 27481640519. The reversal of 27481640509 is 90504618472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27217740484 + 263900025 = 164978^2 + 16245^2 .

It is a cyclic number.

It is not a de Polignac number, because 27481640509 - 2⁵ = 27481640477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27481640519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13740820254 + 13740820255.

It is an arithmetic number, because the mean of its divisors is an integer number (13740820255).

Almost surely, 2^27481640509 is an apocalyptic number.

It is an amenable number.

27481640509 is a deficient number, since it is larger than the sum of its proper divisors (1).

27481640509 is an equidigital number, since it uses as much as digits as its factorization.

27481640509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 27481640509 in words is "twenty-seven billion, four hundred eighty-one million, six hundred forty thousand, five hundred nine".