2178359816 has 8 divisors (see below), whose sum is σ = 4084424670. Its totient is φ = 1089179904.

The previous prime is 2178359791. The next prime is 2178359851. The reversal of 2178359816 is 6189538712.

It can be written as a sum of positive squares in only one way, i.e., 2038883716 + 139476100 = 45154^2 + 11810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136147481 + ... + 136147496.

Almost surely, 2^2178359816 is an apocalyptic number.

It is an amenable number.

2178359816 is a deficient number, since it is larger than the sum of its proper divisors (1906064854).

2178359816 is a wasteful number, since it uses less digits than its factorization.

2178359816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272294983 (or 272294979 counting only the distinct ones).

The product of its digits is 725760, while the sum is 50.

The square root of 2178359816 is about 46672.9023738614. The cubic root of 2178359816 is about 1296.3129880272.

The spelling of 2178359816 in words is "two billion, one hundred seventy-eight million, three hundred fifty-nine thousand, eight hundred sixteen".