27481640477 has 2 divisors, whose sum is σ = 27481640478. Its totient is φ = 27481640476.

The previous prime is 27481640467. The next prime is 27481640509. The reversal of 27481640477 is 77404618472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23515915801 + 3965724676 = 153349^2 + 62974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27481640477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27481640437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13740820238 + 13740820239.

It is an arithmetic number, because the mean of its divisors is an integer number (13740820239).

Almost surely, 2^27481640477 is an apocalyptic number.

It is an amenable number.

27481640477 is a deficient number, since it is larger than the sum of its proper divisors (1).

27481640477 is an equidigital number, since it uses as much as digits as its factorization.

27481640477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2107392, while the sum is 50.

The spelling of 27481640477 in words is "twenty-seven billion, four hundred eighty-one million, six hundred forty thousand, four hundred seventy-seven".