6438131945 has 16 divisors (see below), whose sum is σ = 8849850240. Its totient is φ = 4404513024.

The previous prime is 6438131881. The next prime is 6438131951. The reversal of 6438131945 is 5491318346.

It is a cyclic number.

It is not a de Polignac number, because 6438131945 - 2⁶ = 6438131881 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6438131896 and 6438131905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197255 + ... + 227564.

It is an arithmetic number, because the mean of its divisors is an integer number (553115640).

Almost surely, 2^6438131945 is an apocalyptic number.

It is an amenable number.

6438131945 is a deficient number, since it is larger than the sum of its proper divisors (2411718295).

6438131945 is a wasteful number, since it uses less digits than its factorization.

6438131945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425264.

The product of its digits is 311040, while the sum is 44.

The square root of 6438131945 is about 80237.9707183575. The cubic root of 6438131945 is about 1860.3155845797.

The spelling of 6438131945 in words is "six billion, four hundred thirty-eight million, one hundred thirty-one thousand, nine hundred forty-five".