27661630865 has 32 divisors (see below), whose sum is σ = 37222623360. Its totient is φ = 19556812800.

The previous prime is 27661630837. The next prime is 27661630873. The reversal of 27661630865 is 56803616672.

It is not a de Polignac number, because 27661630865 - 2²⁰ = 27660582289 is a prime.

It is a super-2 number, since 2×27661630865² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2621921 + ... + 2632449.

It is an arithmetic number, because the mean of its divisors is an integer number (1163206980).

Almost surely, 2^27661630865 is an apocalyptic number.

It is an amenable number.

27661630865 is a deficient number, since it is larger than the sum of its proper divisors (9560992495).

27661630865 is a wasteful number, since it uses less digits than its factorization.

27661630865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11873.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 27661630865 in words is "twenty-seven billion, six hundred sixty-one million, six hundred thirty thousand, eight hundred sixty-five".