6495733921 has 4 divisors (see below), whose sum is σ = 6528376000. Its totient is φ = 6463091844.

The previous prime is 6495733879. The next prime is 6495733957. The reversal of 6495733921 is 1293375946.

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 6495733921 - 2¹³ = 6495725729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6495733021) 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, 16320741 + ... + 16321138.

It is an arithmetic number, because the mean of its divisors is an integer number (1632094000).

Almost surely, 2^6495733921 is an apocalyptic number.

It is an amenable number.

6495733921 is a deficient number, since it is larger than the sum of its proper divisors (32642079).

6495733921 is a wasteful number, since it uses less digits than its factorization.

6495733921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32642078.

The product of its digits is 1224720, while the sum is 49.

The square root of 6495733921 is about 80596.1160416555. The cubic root of 6495733921 is about 1865.8472021958.

The spelling of 6495733921 in words is "six billion, four hundred ninety-five million, seven hundred thirty-three thousand, nine hundred twenty-one".