6465755821 has 4 divisors (see below), whose sum is σ = 7389435232. Its totient is φ = 5542076412.

The previous prime is 6465755819. The next prime is 6465755833. The reversal of 6465755821 is 1285575646.

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 6465755821 - 2¹ = 6465755819 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 (6465755861) 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, 461839695 + ... + 461839708.

It is an arithmetic number, because the mean of its divisors is an integer number (1847358808).

Almost surely, 2^6465755821 is an apocalyptic number.

It is an amenable number.

6465755821 is a deficient number, since it is larger than the sum of its proper divisors (923679411).

6465755821 is an equidigital number, since it uses as much as digits as its factorization.

6465755821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923679410.

The product of its digits is 2016000, while the sum is 49.

The square root of 6465755821 is about 80409.9236475200. The cubic root of 6465755821 is about 1862.9724527676.

The spelling of 6465755821 in words is "six billion, four hundred sixty-five million, seven hundred fifty-five thousand, eight hundred twenty-one".