6138668407 has 4 divisors (see below), whose sum is σ = 6138853056. Its totient is φ = 6138483760.

The previous prime is 6138668401. The next prime is 6138668411. The reversal of 6138668407 is 7048668316.

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

It is a cyclic number.

It is not a de Polignac number, because 6138668407 - 2³¹ = 3991184759 is a prime.

It is a super-2 number, since 2×6138668407² = 75366499622199835298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6138668401) 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, 27094 + ... + 114067.

It is an arithmetic number, because the mean of its divisors is an integer number (1534713264).

Almost surely, 2^6138668407 is an apocalyptic number.

6138668407 is a deficient number, since it is larger than the sum of its proper divisors (184649).

6138668407 is a wasteful number, since it uses less digits than its factorization.

6138668407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184648.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 6138668407 is about 78349.6547982185. The cubic root of 6138668407 is about 1831.0128474017.

Subtracting 6138668407 from its reverse (7048668316), we obtain a palindrome (909999909).

The spelling of 6138668407 in words is "six billion, one hundred thirty-eight million, six hundred sixty-eight thousand, four hundred seven".