11637233772921 has 27 divisors (see below), whose sum is σ = 17856552997101. Its totient is φ = 7301684577024.

The previous prime is 11637233772883. The next prime is 11637233773013. The reversal of 11637233772921 is 12927733273611.

The square root of 11637233772921 is 3411339.

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

11637233772921 is a `hidden beast` number, since 1 + 16 + 3 + 7 + 2 + 337 + 7 + 292 + 1 = 666.

11637233772921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 550571420025 + 11086662352896 = 742005^2 + 3329664^2 .

It is not a de Polignac number, because 11637233772921 - 2¹¹ = 11637233770873 is a prime.

It is a super-2 number, since 2×11637233772921² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11637231772921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 173944845 + ... + 174011733.

Almost surely, 2^{11637233772921} is an apocalyptic number.

11637233772921 is the 3411339-th square number.

11637233772921 is the 1705670-th centered octagonal number.

It is an amenable number.

11637233772921 is a deficient number, since it is larger than the sum of its proper divisors (6219319224180).

11637233772921 is an frugal number, since it uses more digits than its factorization.

11637233772921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133818 (or 66909 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The spelling of 11637233772921 in words is "eleven trillion, six hundred thirty-seven billion, two hundred thirty-three million, seven hundred seventy-two thousand, nine hundred twenty-one".