6457065821 has 4 divisors (see below), whose sum is σ = 6479882592. Its totient is φ = 6434249052.

The previous prime is 6457065751. The next prime is 6457065859. The reversal of 6457065821 is 1285607546.

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 a de Polignac number, because none of the positive numbers 2^k-6457065821 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 (6457065871) 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, 11407961 + ... + 11408526.

It is an arithmetic number, because the mean of its divisors is an integer number (1619970648).

Almost surely, 2^6457065821 is an apocalyptic number.

It is an amenable number.

6457065821 is a deficient number, since it is larger than the sum of its proper divisors (22816771).

6457065821 is a wasteful number, since it uses less digits than its factorization.

6457065821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22816770.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 6457065821 is about 80355.8698602660. The cubic root of 6457065821 is about 1862.1374645992.

The spelling of 6457065821 in words is "six billion, four hundred fifty-seven million, sixty-five thousand, eight hundred twenty-one".