11553521052538 has 8 divisors (see below), whose sum is σ = 17389429298388. Its totient is φ = 5757044619744.

The previous prime is 11553521052461. The next prime is 11553521052547. The reversal of 11553521052538 is 83525012535511.

It can be written as a sum of positive squares in 2 ways, for example, as 11545024453209 + 8496599329 = 3397797^2 + 92177^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×11553521052538² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9857952531 + ... + 9857953702.

Almost surely, 2^{11553521052538} is an apocalyptic number.

11553521052538 is a deficient number, since it is larger than the sum of its proper divisors (5835908245850).

11553521052538 is a wasteful number, since it uses less digits than its factorization.

11553521052538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19715906528.

The product of its (nonzero) digits is 900000, while the sum is 46.

The spelling of 11553521052538 in words is "eleven trillion, five hundred fifty-three billion, five hundred twenty-one million, fifty-two thousand, five hundred thirty-eight".