27664345473 has 16 divisors (see below), whose sum is σ = 37267467456. Its totient is φ = 18252875520.

The previous prime is 27664345469. The next prime is 27664345549. The reversal of 27664345473 is 37454346672.

It is not a de Polignac number, because 27664345473 - 2² = 27664345469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27664345433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34365 + ... + 237717.

It is an arithmetic number, because the mean of its divisors is an integer number (2329216716).

Almost surely, 2^27664345473 is an apocalyptic number.

It is an amenable number.

27664345473 is a deficient number, since it is larger than the sum of its proper divisors (9603121983).

27664345473 is a wasteful number, since it uses less digits than its factorization.

27664345473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203824.

The product of its digits is 10160640, while the sum is 51.

The spelling of 27664345473 in words is "twenty-seven billion, six hundred sixty-four million, three hundred forty-five thousand, four hundred seventy-three".