5555978166 has 32 divisors (see below), whose sum is σ = 11504908800. Its totient is φ = 1786609440.

The previous prime is 5555978161. The next prime is 5555978171. The reversal of 5555978166 is 6618795555.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5555978161) and next prime (5555978171).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5555978161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201225 + ... + 227163.

It is an arithmetic number, because the mean of its divisors is an integer number (359528400).

Almost surely, 2^5555978166 is an apocalyptic number.

5555978166 is an abundant number, since it is smaller than the sum of its proper divisors (5948930634).

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

5555978166 is a wasteful number, since it uses less digits than its factorization.

5555978166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27204.

The product of its digits is 11340000, while the sum is 57.

The square root of 5555978166 is about 74538.4341531267. The cubic root of 5555978166 is about 1771.1425232267.

The spelling of 5555978166 in words is "five billion, five hundred fifty-five million, nine hundred seventy-eight thousand, one hundred sixty-six".