2178629607864 has 16 divisors (see below), whose sum is σ = 5446574019720. Its totient is φ = 726209869280.

The previous prime is 2178629607851. The next prime is 2178629607887. The reversal of 2178629607864 is 4687069268712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2178629607795 and 2178629607804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45388116807 + ... + 45388116854.

Almost surely, 2^{2178629607864} is an apocalyptic number.

2178629607864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2178629607864 is an abundant number, since it is smaller than the sum of its proper divisors (3267944411856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2178629607864 is a wasteful number, since it uses less digits than its factorization.

2178629607864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90776233670 (or 90776233666 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 2178629607864 in words is "two trillion, one hundred seventy-eight billion, six hundred twenty-nine million, six hundred seven thousand, eight hundred sixty-four".