11551531261361 has 16 divisors (see below), whose sum is σ = 14304491773824. Its totient is φ = 9083601460224.

The previous prime is 11551531261327. The next prime is 11551531261367. The reversal of 11551531261361 is 16316213515511.

11551531261361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11551531261361 - 2⁴² = 7153484750257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11551531261367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389371376 + ... + 389401041.

It is an arithmetic number, because the mean of its divisors is an integer number (894030735864).

Almost surely, 2^{11551531261361} is an apocalyptic number.

It is an amenable number.

11551531261361 is a deficient number, since it is larger than the sum of its proper divisors (2752960512463).

11551531261361 is a wasteful number, since it uses less digits than its factorization.

11551531261361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778772600.

The product of its digits is 81000, while the sum is 41.

Adding to 11551531261361 its reverse (16316213515511), we get a palindrome (27867744776872).

The spelling of 11551531261361 in words is "eleven trillion, five hundred fifty-one billion, five hundred thirty-one million, two hundred sixty-one thousand, three hundred sixty-one".