27173638311556 has 27 divisors (see below), whose sum is σ = 52270173631767. Its totient is φ = 12351601649640.

The previous prime is 27173638311551. The next prime is 27173638311593. The reversal of 27173638311556 is 65511383637172.

The square root of 27173638311556 is 5212834.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×27173638311556² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27173638311556.

It is not an unprimeable number, because it can be changed into a prime (27173638311551) 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, 114563875 + ... + 114800821.

Almost surely, 2^{27173638311556} is an apocalyptic number.

27173638311556 is the 5212834-th square number.

It is an amenable number.

27173638311556 is a deficient number, since it is larger than the sum of its proper divisors (25096535320211).

27173638311556 is an frugal number, since it uses more digits than its factorization.

27173638311556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473920 (or 236960 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 58.

The spelling of 27173638311556 in words is "twenty-seven trillion, one hundred seventy-three billion, six hundred thirty-eight million, three hundred eleven thousand, five hundred fifty-six".