2185662638 has 4 divisors (see below), whose sum is σ = 3278493960. Its totient is φ = 1092831318.

The previous prime is 2185662629. The next prime is 2185662641. The reversal of 2185662638 is 8362665812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 2185662592 and 2185662601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 546415658 + ... + 546415661.

It is an arithmetic number, because the mean of its divisors is an integer number (819623490).

Almost surely, 2^2185662638 is an apocalyptic number.

2185662638 is a deficient number, since it is larger than the sum of its proper divisors (1092831322).

2185662638 is a wasteful number, since it uses less digits than its factorization.

2185662638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092831321.

The product of its digits is 829440, while the sum is 47.

The square root of 2185662638 is about 46751.0709823850. The cubic root of 2185662638 is about 1297.7599763682.

The spelling of 2185662638 in words is "two billion, one hundred eighty-five million, six hundred sixty-two thousand, six hundred thirty-eight".