2166208654 has 16 divisors (see below), whose sum is σ = 3278313648. Its totient is φ = 1073463232.

The previous prime is 2166208619. The next prime is 2166208657. The reversal of 2166208654 is 4568026612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166208657) 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, 172869 + ... + 184975.

It is an arithmetic number, because the mean of its divisors is an integer number (204894603).

Almost surely, 2^2166208654 is an apocalyptic number.

2166208654 is a deficient number, since it is larger than the sum of its proper divisors (1112104994).

2166208654 is a wasteful number, since it uses less digits than its factorization.

2166208654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12899.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 2166208654 is about 46542.5467072871. The cubic root of 2166208654 is about 1293.8981606821.

The spelling of 2166208654 in words is "two billion, one hundred sixty-six million, two hundred eight thousand, six hundred fifty-four".