6442888517 has 8 divisors (see below), whose sum is σ = 6953552760. Its totient is φ = 5934375360.

The previous prime is 6442888513. The next prime is 6442888537. The reversal of 6442888517 is 7158882446.

It can be written as a sum of positive squares in 4 ways, for example, as 1161378241 + 5281510276 = 34079^2 + 72674^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6442888517 - 2² = 6442888513 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 (6442888511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531542 + ... + 543527.

It is an arithmetic number, because the mean of its divisors is an integer number (869194095).

Almost surely, 2^6442888517 is an apocalyptic number.

It is an amenable number.

6442888517 is a deficient number, since it is larger than the sum of its proper divisors (510664243).

6442888517 is a wasteful number, since it uses less digits than its factorization.

6442888517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075543.

The product of its digits is 3440640, while the sum is 53.

The square root of 6442888517 is about 80267.6056513460. The cubic root of 6442888517 is about 1860.7736132340.

The spelling of 6442888517 in words is "six billion, four hundred forty-two million, eight hundred eighty-eight thousand, five hundred seventeen".