55121166661165 has 16 divisors (see below), whose sum is σ = 72162186014016. Its totient is φ = 40086139075200.

The previous prime is 55121166661133. The next prime is 55121166661283. The reversal of 55121166661165 is 56116666112155.

It is not a de Polignac number, because 55121166661165 - 2⁵ = 55121166661133 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 15 ways as a sum of consecutive naturals, for example, 23653731 + ... + 25879360.

It is an arithmetic number, because the mean of its divisors is an integer number (4510136625876).

Almost surely, 2^{55121166661165} is an apocalyptic number.

55121166661165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55121166661165 is a deficient number, since it is larger than the sum of its proper divisors (17041019352851).

55121166661165 is a wasteful number, since it uses less digits than its factorization.

55121166661165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49553340.

The product of its digits is 1944000, while the sum is 52.

The spelling of 55121166661165 in words is "fifty-five trillion, one hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-one thousand, one hundred sixty-five".