6385721975 has 18 divisors (see below), whose sum is σ = 8090424144. Its totient is φ = 4999841200.

The previous prime is 6385721963. The next prime is 6385721977. The reversal of 6385721975 is 5791275836.

It is not a de Polignac number, because 6385721975 - 2⁴ = 6385721959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6385721977) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2591 + ... + 113040.

It is an arithmetic number, because the mean of its divisors is an integer number (449468008).

Almost surely, 2^6385721975 is an apocalyptic number.

6385721975 is a deficient number, since it is larger than the sum of its proper divisors (1704702169).

6385721975 is a wasteful number, since it uses less digits than its factorization.

6385721975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115735 (or 115683 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 53.

The square root of 6385721975 is about 79910.7125171588. The cubic root of 6385721975 is about 1855.2538237347.

The spelling of 6385721975 in words is "six billion, three hundred eighty-five million, seven hundred twenty-one thousand, nine hundred seventy-five".