27681551923 has 16 divisors (see below), whose sum is σ = 28774932480. Its totient is φ = 26608590400.

The previous prime is 27681551921. The next prime is 27681551957. The reversal of 27681551923 is 32915518672.

It is a cyclic number.

It is not a de Polignac number, because 27681551923 - 2¹ = 27681551921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27681551921) 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, 7820088 + ... + 7823626.

It is an arithmetic number, because the mean of its divisors is an integer number (1798433280).

Almost surely, 2^27681551923 is an apocalyptic number.

27681551923 is a deficient number, since it is larger than the sum of its proper divisors (1093380557).

27681551923 is a wasteful number, since it uses less digits than its factorization.

27681551923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338.

The product of its digits is 907200, while the sum is 49.

The spelling of 27681551923 in words is "twenty-seven billion, six hundred eighty-one million, five hundred fifty-one thousand, nine hundred twenty-three".