2118164861 has 8 divisors (see below), whose sum is σ = 2273486904. Its totient is φ = 1966256640.

The previous prime is 2118164849. The next prime is 2118164879. The reversal of 2118164861 is 1684618112.

It can be written as a sum of positive squares in 4 ways, for example, as 338928100 + 1779236761 = 18410^2 + 42181^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2118164861 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 (2118161861) 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, 852170 + ... + 854651.

It is an arithmetic number, because the mean of its divisors is an integer number (284185863).

Almost surely, 2^2118164861 is an apocalyptic number.

It is an amenable number.

2118164861 is a deficient number, since it is larger than the sum of its proper divisors (155322043).

2118164861 is a wasteful number, since it uses less digits than its factorization.

2118164861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706911.

The product of its digits is 18432, while the sum is 38.

The square root of 2118164861 is about 46023.5250822881. The cubic root of 2118164861 is about 1284.2608781183.

The spelling of 2118164861 in words is "two billion, one hundred eighteen million, one hundred sixty-four thousand, eight hundred sixty-one".