27661590653 has 2 divisors, whose sum is σ = 27661590654. Its totient is φ = 27661590652.

The previous prime is 27661590631. The next prime is 27661590689. The reversal of 27661590653 is 35609516672.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21331478809 + 6330111844 = 146053^2 + 79562^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661590653 - 2¹⁰ = 27661589629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27661595653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830795326 + 13830795327.

It is an arithmetic number, because the mean of its divisors is an integer number (13830795327).

Almost surely, 2^27661590653 is an apocalyptic number.

It is an amenable number.

27661590653 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661590653 is an equidigital number, since it uses as much as digits as its factorization.

27661590653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 27661590653 in words is "twenty-seven billion, six hundred sixty-one million, five hundred ninety thousand, six hundred fifty-three".