27616563409 has 4 divisors (see below), whose sum is σ = 27619342516. Its totient is φ = 27613784304.

The previous prime is 27616563341. The next prime is 27616563431. The reversal of 27616563409 is 90436561672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17306191809 + 10310371600 = 131553^2 + 101540^2 .

It is a cyclic number.

It is not a de Polignac number, because 27616563409 - 2⁷ = 27616563281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27616563449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374594 + ... + 1394539.

It is an arithmetic number, because the mean of its divisors is an integer number (6904835629).

Almost surely, 2^27616563409 is an apocalyptic number.

It is an amenable number.

27616563409 is a deficient number, since it is larger than the sum of its proper divisors (2779107).

27616563409 is an equidigital number, since it uses as much as digits as its factorization.

27616563409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779106.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 27616563409 in words is "twenty-seven billion, six hundred sixteen million, five hundred sixty-three thousand, four hundred nine".