6551166561 has 16 divisors (see below), whose sum is σ = 8860416000. Its totient is φ = 4304868048.

The previous prime is 6551166547. The next prime is 6551166607. The reversal of 6551166561 is 1656611556.

6551166561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6551166561 - 2²⁷ = 6416948833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6551166361) 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, 118890 + ... + 165036.

It is an arithmetic number, because the mean of its divisors is an integer number (553776000).

Almost surely, 2^6551166561 is an apocalyptic number.

It is an amenable number.

6551166561 is a deficient number, since it is larger than the sum of its proper divisors (2309249439).

6551166561 is a wasteful number, since it uses less digits than its factorization.

6551166561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46828.

The product of its digits is 162000, while the sum is 42.

The square root of 6551166561 is about 80939.2769982534. The cubic root of 6551166561 is about 1871.1397020765.

The spelling of 6551166561 in words is "six billion, five hundred fifty-one million, one hundred sixty-six thousand, five hundred sixty-one".