11611561121 has 8 divisors (see below), whose sum is σ = 11805048000. Its totient is φ = 11418175440.

The previous prime is 11611561099. The next prime is 11611561123. The reversal of 11611561121 is 12116511611.

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 11611561121 - 2⁶ = 11611561057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11611561123) 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, 226820 + ... + 273258.

It is an arithmetic number, because the mean of its divisors is an integer number (1475631000).

Almost surely, 2^11611561121 is an apocalyptic number.

It is an amenable number.

11611561121 is a deficient number, since it is larger than the sum of its proper divisors (193486879).

11611561121 is an equidigital number, since it uses as much as digits as its factorization.

11611561121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50599.

The product of its digits is 360, while the sum is 26.

The spelling of 11611561121 in words is "eleven billion, six hundred eleven million, five hundred sixty-one thousand, one hundred twenty-one".