55161260121 has 16 divisors (see below), whose sum is σ = 81250191360. Its totient is φ = 33007887120.

The previous prime is 55161260117. The next prime is 55161260179. The reversal of 55161260121 is 12106216155.

It is not a de Polignac number, because 55161260121 - 2² = 55161260117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55161261121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10576845 + ... + 10582058.

It is an arithmetic number, because the mean of its divisors is an integer number (5078136960).

Almost surely, 2^55161260121 is an apocalyptic number.

It is an amenable number.

55161260121 is a deficient number, since it is larger than the sum of its proper divisors (26088931239).

55161260121 is a wasteful number, since it uses less digits than its factorization.

55161260121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21158996.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 55161260121 its reverse (12106216155), we get a palindrome (67267476276).

The spelling of 55161260121 in words is "fifty-five billion, one hundred sixty-one million, two hundred sixty thousand, one hundred twenty-one".