27640437871 has 2 divisors, whose sum is σ = 27640437872. Its totient is φ = 27640437870.

The previous prime is 27640437829. The next prime is 27640437901. The reversal of 27640437871 is 17873404672.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27640437871 - 2⁷ = 27640437743 is a prime.

It is a super-2 number, since 2×27640437871² (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 (27640432871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820218935 + 13820218936.

It is an arithmetic number, because the mean of its divisors is an integer number (13820218936).

Almost surely, 2^27640437871 is an apocalyptic number.

27640437871 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640437871 is an equidigital number, since it uses as much as digits as its factorization.

27640437871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 49.

The spelling of 27640437871 in words is "twenty-seven billion, six hundred forty million, four hundred thirty-seven thousand, eight hundred seventy-one".