27581765656 has 16 divisors (see below), whose sum is σ = 53384063040. Its totient is φ = 13346015520.

The previous prime is 27581765647. The next prime is 27581765681. The reversal of 27581765656 is 65656718572.

It is a super-2 number, since 2×27581765656² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27581765656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55608151 + ... + 55608646.

It is an arithmetic number, because the mean of its divisors is an integer number (3336503940).

Almost surely, 2^27581765656 is an apocalyptic number.

It is an amenable number.

27581765656 is a deficient number, since it is larger than the sum of its proper divisors (25802297384).

27581765656 is a wasteful number, since it uses less digits than its factorization.

27581765656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111216834 (or 111216830 counting only the distinct ones).

The product of its digits is 21168000, while the sum is 58.

The spelling of 27581765656 in words is "twenty-seven billion, five hundred eighty-one million, seven hundred sixty-five thousand, six hundred fifty-six".