11661610055 has 4 divisors (see below), whose sum is σ = 13993932072. Its totient is φ = 9329288040.

The previous prime is 11661610001. The next prime is 11661610099. The reversal of 11661610055 is 55001616611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11661610055 - 2¹⁰ = 11661609031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166161001 + ... + 1166161010.

It is an arithmetic number, because the mean of its divisors is an integer number (3498483018).

Almost surely, 2^11661610055 is an apocalyptic number.

11661610055 is a deficient number, since it is larger than the sum of its proper divisors (2332322017).

11661610055 is an equidigital number, since it uses as much as digits as its factorization.

11661610055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332322016.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 11661610055 in words is "eleven billion, six hundred sixty-one million, six hundred ten thousand, fifty-five".