27957782865 has 16 divisors (see below), whose sum is σ = 44743464000. Its totient is φ = 14907147072.

The previous prime is 27957782857. The next prime is 27957782887. The reversal of 27957782865 is 56828775972.

It is not a de Polignac number, because 27957782865 - 2³ = 27957782857 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27957782796 and 27957782805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165870 + ... + 288839.

It is an arithmetic number, because the mean of its divisors is an integer number (2796466500).

Almost surely, 2^27957782865 is an apocalyptic number.

It is an amenable number.

27957782865 is a deficient number, since it is larger than the sum of its proper divisors (16785681135).

27957782865 is a wasteful number, since it uses less digits than its factorization.

27957782865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458816.

The product of its digits is 118540800, while the sum is 66.

The spelling of 27957782865 in words is "twenty-seven billion, nine hundred fifty-seven million, seven hundred eighty-two thousand, eight hundred sixty-five".