27526459921 has 9 divisors (see below), whose sum is σ = 27678437499. Its totient is φ = 27375315000.

The previous prime is 27526459913. The next prime is 27526459943. The reversal of 27526459921 is 12995462572.

It is a happy number.

The square root of 27526459921 is 165911.

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., 21856369921 + 5670090000 = 147839^2 + 75300^2 .

It is not a de Polignac number, because 27526459921 - 2³ = 27526459913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27526459621) 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, 41643331 + ... + 41643991.

Almost surely, 2^27526459921 is an apocalyptic number.

27526459921 is the 165911-st square number.

27526459921 is the 82956-th centered octagonal number.

It is an amenable number.

27526459921 is a deficient number, since it is larger than the sum of its proper divisors (151977578).

27526459921 is an frugal number, since it uses more digits than its factorization.

27526459921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 912 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 52.

The spelling of 27526459921 in words is "twenty-seven billion, five hundred twenty-six million, four hundred fifty-nine thousand, nine hundred twenty-one".