27997701656 has 16 divisors (see below), whose sum is σ = 52515267840. Its totient is φ = 13993630240.

The previous prime is 27997701653. The next prime is 27997701689. The reversal of 27997701656 is 65610779972.

It is a junction number, because it is equal to n+sod(n) for n = 27997701595 and 27997701604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997701653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629735 + ... + 672726.

It is an arithmetic number, because the mean of its divisors is an integer number (3282204240).

Almost surely, 2^27997701656 is an apocalyptic number.

It is an amenable number.

27997701656 is a deficient number, since it is larger than the sum of its proper divisors (24517566184).

27997701656 is a wasteful number, since it uses less digits than its factorization.

27997701656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305154 (or 1305150 counting only the distinct ones).

The product of its (nonzero) digits is 10001880, while the sum is 59.

The spelling of 27997701656 in words is "twenty-seven billion, nine hundred ninety-seven million, seven hundred one thousand, six hundred fifty-six".