5561660166 has 16 divisors (see below), whose sum is σ = 11128104000. Its totient is φ = 1853089448.

The previous prime is 5561660149. The next prime is 5561660173. The reversal of 5561660166 is 6610661655.

It is a super-2 number, since 2×5561660166² = 61864127604142295112, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184116 + ... + 212183.

It is an arithmetic number, because the mean of its divisors is an integer number (695506500).

Almost surely, 2^5561660166 is an apocalyptic number.

5561660166 is an abundant number, since it is smaller than the sum of its proper divisors (5566443834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5561660166 is a wasteful number, since it uses less digits than its factorization.

5561660166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398643.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 5561660166 is about 74576.5389784214. The cubic root of 5561660166 is about 1771.7460895014.

The spelling of 5561660166 in words is "five billion, five hundred sixty-one million, six hundred sixty thousand, one hundred sixty-six".