27931606658 has 18 divisors (see below), whose sum is σ = 42640860099. Its totient is φ = 13722240532.

The previous prime is 27931606657. The next prime is 27931606699. The reversal of 27931606658 is 85660613972.

It can be written as a sum of positive squares in only one way, i.e., 13965803329 + 13965803329 = 118177^2 + 118177^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118177.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27931606657) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13943885 + ... + 13945887.

Almost surely, 2^27931606658 is an apocalyptic number.

27931606658 is a deficient number, since it is larger than the sum of its proper divisors (14709253441).

27931606658 is an frugal number, since it uses more digits than its factorization.

27931606658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126 (or 2064 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 27931606658 in words is "twenty-seven billion, nine hundred thirty-one million, six hundred six thousand, six hundred fifty-eight".