2115172166 has 16 divisors (see below), whose sum is σ = 3212791344. Its totient is φ = 1044256224.

The previous prime is 2115172097. The next prime is 2115172201. The reversal of 2115172166 is 6612715112.

It is a super-2 number, since 2×2115172166² = 8947906583642263112, 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, 538040 + ... + 541956.

It is an arithmetic number, because the mean of its divisors is an integer number (200799459).

Almost surely, 2^2115172166 is an apocalyptic number.

2115172166 is a deficient number, since it is larger than the sum of its proper divisors (1097619178).

2115172166 is a wasteful number, since it uses less digits than its factorization.

2115172166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255.

The product of its digits is 5040, while the sum is 32.

The square root of 2115172166 is about 45991.0009240938. Note that the first 3 decimals coincide. The cubic root of 2115172166 is about 1283.6557611326.

Adding to 2115172166 its reverse (6612715112), we get a palindrome (8727887278).

The spelling of 2115172166 in words is "two billion, one hundred fifteen million, one hundred seventy-two thousand, one hundred sixty-six".