4138642681 has 4 divisors (see below), whose sum is σ = 4356466000. Its totient is φ = 3920819364.

The previous prime is 4138642679. The next prime is 4138642699. The reversal of 4138642681 is 1862468314.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4138642681 - 2¹ = 4138642679 is a prime.

It is a super-2 number, since 2×4138642681² = 34256726481989735522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4138642181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108911631 + ... + 108911668.

It is an arithmetic number, because the mean of its divisors is an integer number (1089116500).

Almost surely, 2^4138642681 is an apocalyptic number.

It is an amenable number.

4138642681 is a deficient number, since it is larger than the sum of its proper divisors (217823319).

4138642681 is a wasteful number, since it uses less digits than its factorization.

4138642681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217823318.

The product of its digits is 221184, while the sum is 43.

The square root of 4138642681 is about 64332.2833498081. The cubic root of 4138642681 is about 1605.5332746576.

The spelling of 4138642681 in words is "four billion, one hundred thirty-eight million, six hundred forty-two thousand, six hundred eighty-one".