2169164978 has 6 divisors (see below), whose sum is σ = 3253846269. Its totient is φ = 1084549556.

The previous prime is 2169164969. The next prime is 2169165007. The reversal of 2169164978 is 8794619612.

It can be written as a sum of positive squares in 2 ways, for example, as 1559223169 + 609941809 = 39487^2 + 24697^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=32933.

It is a super-3 number, since 3×2169164978³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 49400 + ... + 82332.

Almost surely, 2^2169164978 is an apocalyptic number.

2169164978 is a deficient number, since it is larger than the sum of its proper divisors (1084681291).

2169164978 is an frugal number, since it uses more digits than its factorization.

2169164978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65868 (or 32935 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 53.

The square root of 2169164978 is about 46574.2952496331. The cubic root of 2169164978 is about 1294.4865071100.

The spelling of 2169164978 in words is "two billion, one hundred sixty-nine million, one hundred sixty-four thousand, nine hundred seventy-eight".