11551565606161 has 8 divisors (see below), whose sum is σ = 13215110956544. Its totient is φ = 9891350678880.

The previous prime is 11551565606143. The next prime is 11551565606177. The reversal of 11551565606161 is 16160656515511.

11551565606161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11551565606161 - 2⁵ = 11551565606129 is a prime.

It is a super-2 number, since 2×11551565606161² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11551565606261) 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, 832598340 + ... + 832612213.

It is an arithmetic number, because the mean of its divisors is an integer number (1651888869568).

Almost surely, 2^{11551565606161} is an apocalyptic number.

It is an amenable number.

11551565606161 is a deficient number, since it is larger than the sum of its proper divisors (1663545350383).

11551565606161 is an equidigital number, since it uses as much as digits as its factorization.

11551565606161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665211551.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 11551565606161 in words is "eleven trillion, five hundred fifty-one billion, five hundred sixty-five million, six hundred six thousand, one hundred sixty-one".