27211607665 has 8 divisors (see below), whose sum is σ = 35622468288. Its totient is φ = 19790260080.

The previous prime is 27211607659. The next prime is 27211607681. The reversal of 27211607665 is 56670611272.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27211607665 - 2²¹ = 27209510513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247378197 + ... + 247378306.

It is an arithmetic number, because the mean of its divisors is an integer number (4452808536).

Almost surely, 2^27211607665 is an apocalyptic number.

It is an amenable number.

27211607665 is a deficient number, since it is larger than the sum of its proper divisors (8410860623).

27211607665 is a wasteful number, since it uses less digits than its factorization.

27211607665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494756519.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 27211607665 in words is "twenty-seven billion, two hundred eleven million, six hundred seven thousand, six hundred sixty-five".