27657463666 has 24 divisors (see below), whose sum is σ = 49563767916. Its totient is φ = 11532840480.

The previous prime is 27657463651. The next prime is 27657463679. The reversal of 27657463666 is 66636475672.

It can be written as a sum of positive squares in 2 ways, for example, as 20989924641 + 6667539025 = 144879^2 + 81655^2 .

It is a super-2 number, since 2×27657463666² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 27657463666.

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 11 ways as a sum of consecutive naturals, for example, 3810145 + ... + 3817396.

Almost surely, 2^27657463666 is an apocalyptic number.

27657463666 is a deficient number, since it is larger than the sum of its proper divisors (21906304250).

27657463666 is a wasteful number, since it uses less digits than its factorization.

27657463666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7627594 (or 7627587 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 58.

The spelling of 27657463666 in words is "twenty-seven billion, six hundred fifty-seven million, four hundred sixty-three thousand, six hundred sixty-six".