55161666116661 has 8 divisors (see below), whose sum is σ = 79206494936800. Its totient is φ = 33945640687152.

The previous prime is 55161666116657. The next prime is 55161666116663. The reversal of 55161666116661 is 16661166616155.

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

It is not a de Polignac number, because 55161666116661 - 2² = 55161666116657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55161666116663) 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, 707200847611 + ... + 707200847688.

It is an arithmetic number, because the mean of its divisors is an integer number (9900811867100).

Almost surely, 2^{55161666116661} is an apocalyptic number.

It is an amenable number.

55161666116661 is a deficient number, since it is larger than the sum of its proper divisors (24044828820139).

55161666116661 is a wasteful number, since it uses less digits than its factorization.

55161666116661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414401695315.

The product of its digits is 6998400, while the sum is 57.

The spelling of 55161666116661 in words is "fifty-five trillion, one hundred sixty-one billion, six hundred sixty-six million, one hundred sixteen thousand, six hundred sixty-one".