2138517718 has 4 divisors (see below), whose sum is σ = 3207776580. Its totient is φ = 1069258858.

The previous prime is 2138517709. The next prime is 2138517757. The reversal of 2138517718 is 8177158312.

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

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, 534629428 + ... + 534629431.

It is an arithmetic number, because the mean of its divisors is an integer number (801944145).

Almost surely, 2^2138517718 is an apocalyptic number.

2138517718 is a deficient number, since it is larger than the sum of its proper divisors (1069258862).

2138517718 is a wasteful number, since it uses less digits than its factorization.

2138517718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069258861.

The product of its digits is 94080, while the sum is 43.

The square root of 2138517718 is about 46244.1100898266. The cubic root of 2138517718 is about 1288.3611417860.

The spelling of 2138517718 in words is "two billion, one hundred thirty-eight million, five hundred seventeen thousand, seven hundred eighteen".