11161557106521 has 16 divisors (see below), whose sum is σ = 14924698905600. Its totient is φ = 7419729936528.

The previous prime is 11161557106507. The next prime is 11161557106541. The reversal of 11161557106521 is 12560175516111.

11161557106521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11161557106521 - 2¹⁴ = 11161557090137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11161557106541) 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, 13579140 + ... + 14377626.

It is an arithmetic number, because the mean of its divisors is an integer number (932793681600).

Almost surely, 2^{11161557106521} is an apocalyptic number.

It is an amenable number.

11161557106521 is a deficient number, since it is larger than the sum of its proper divisors (3763141799079).

11161557106521 is a wasteful number, since it uses less digits than its factorization.

11161557106521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811828.

The product of its (nonzero) digits is 63000, while the sum is 42.

The spelling of 11161557106521 in words is "eleven trillion, one hundred sixty-one billion, five hundred fifty-seven million, one hundred six thousand, five hundred twenty-one".