27758501665 has 16 divisors (see below), whose sum is σ = 33817053888. Its totient is φ = 21869090496.

The previous prime is 27758501609. The next prime is 27758501711. The reversal of 27758501665 is 56610585772.

It is a cyclic number.

It is not a de Polignac number, because 27758501665 - 2¹¹ = 27758499617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415014 + ... + 1434496.

It is an arithmetic number, because the mean of its divisors is an integer number (2113565868).

Almost surely, 2^27758501665 is an apocalyptic number.

It is an amenable number.

27758501665 is a deficient number, since it is larger than the sum of its proper divisors (6058552223).

27758501665 is a wasteful number, since it uses less digits than its factorization.

27758501665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23808.

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 27758501665 in words is "twenty-seven billion, seven hundred fifty-eight million, five hundred one thousand, six hundred sixty-five".