11553206240261 has 8 divisors (see below), whose sum is σ = 13473126811200. Its totient is φ = 9902748205644.

The previous prime is 11553206240231. The next prime is 11553206240287. The reversal of 11553206240261 is 16204260235511.

It is a de Polignac number, because none of the positive numbers 2^k-11553206240261 is a prime.

It is a super-2 number, since 2×11553206240261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11553206240231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16841408171 + ... + 16841408856.

It is an arithmetic number, because the mean of its divisors is an integer number (1684140851400).

Almost surely, 2^{11553206240261} is an apocalyptic number.

It is an amenable number.

11553206240261 is a deficient number, since it is larger than the sum of its proper divisors (1919920570939).

11553206240261 is an frugal number, since it uses more digits than its factorization.

11553206240261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33682817048 (or 33682817034 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 11553206240261 its reverse (16204260235511), we get a palindrome (27757466475772).

The spelling of 11553206240261 in words is "eleven trillion, five hundred fifty-three billion, two hundred six million, two hundred forty thousand, two hundred sixty-one".