6526382721 has 4 divisors (see below), whose sum is σ = 8701843632. Its totient is φ = 4350921812.

The previous prime is 6526382657. The next prime is 6526382743. The reversal of 6526382721 is 1272836256.

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 6526382721 - 2⁶ = 6526382657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6526382771) 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, 1087730451 + ... + 1087730456.

It is an arithmetic number, because the mean of its divisors is an integer number (2175460908).

Almost surely, 2^6526382721 is an apocalyptic number.

It is an amenable number.

6526382721 is a deficient number, since it is larger than the sum of its proper divisors (2175460911).

6526382721 is a wasteful number, since it uses less digits than its factorization.

6526382721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175460910.

The product of its digits is 241920, while the sum is 42.

The square root of 6526382721 is about 80786.0304817609. The cubic root of 6526382721 is about 1868.7771391517. Note that the first 3 decimals are identical.

The spelling of 6526382721 in words is "six billion, five hundred twenty-six million, three hundred eighty-two thousand, seven hundred twenty-one".