27792557521 has 9 divisors (see below), whose sum is σ = 28461268251. Its totient is φ = 27139217112.

The previous prime is 27792557519. The next prime is 27792557539. The reversal of 27792557521 is 12575529772.

The square root of 27792557521 is 166711.

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

It can be written as a sum of positive squares in only one way, i.e., 7066924225 + 20725633296 = 84065^2 + 143964^2 .

It is not a de Polignac number, because 27792557521 - 2¹ = 27792557519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27792557561) 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, 7166635 + ... + 7170511.

It is an arithmetic number, because the mean of its divisors is an integer number (3162363139).

Almost surely, 2^27792557521 is an apocalyptic number.

27792557521 is the 166711-st square number.

27792557521 is the 83356-th centered octagonal number.

It is an amenable number.

27792557521 is a deficient number, since it is larger than the sum of its proper divisors (668710730).

27792557521 is an frugal number, since it uses more digits than its factorization.

27792557521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7840 (or 3920 counting only the distinct ones).

The product of its digits is 3087000, while the sum is 52.

The spelling of 27792557521 in words is "twenty-seven billion, seven hundred ninety-two million, five hundred fifty-seven thousand, five hundred twenty-one".