2178648975 has 24 divisors (see below), whose sum is σ = 3604193920. Its totient is φ = 1161249120.

The previous prime is 2178648971. The next prime is 2178649001. The reversal of 2178648975 is 5798468712.

It is a Cunningham number, because it is equal to 46676²-1.

It is not a de Polignac number, because 2178648975 - 2² = 2178648971 is a prime.

It is a super-2 number, since 2×2178648975² = 9493022712537101250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178648971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132246 + ... + 147804.

Almost surely, 2^2178648975 is an apocalyptic number.

2178648975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2178648975 is a deficient number, since it is larger than the sum of its proper divisors (1425544945).

2178648975 is a wasteful number, since it uses less digits than its factorization.

2178648975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17439 (or 17434 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The square root of 2178648975 is about 46675.9999892879. Note that the first 4 decimals coincide. The cubic root of 2178648975 is about 1296.3703437160.

The spelling of 2178648975 in words is "two billion, one hundred seventy-eight million, six hundred forty-eight thousand, nine hundred seventy-five".