6459977521 has 4 divisors (see below), whose sum is σ = 6460150000. Its totient is φ = 6459805044.

The previous prime is 6459977467. The next prime is 6459977527. The reversal of 6459977521 is 1257799546.

It is a happy number.

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 6459977521 - 2²⁷ = 6325759793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6459977527) 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, 3771 + ... + 113728.

It is an arithmetic number, because the mean of its divisors is an integer number (1615037500).

Almost surely, 2^6459977521 is an apocalyptic number.

It is an amenable number.

6459977521 is a deficient number, since it is larger than the sum of its proper divisors (172479).

6459977521 is a wasteful number, since it uses less digits than its factorization.

6459977521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172478.

The product of its digits is 4762800, while the sum is 55.

The square root of 6459977521 is about 80373.9853497386. The cubic root of 6459977521 is about 1862.4173218918.

The spelling of 6459977521 in words is "six billion, four hundred fifty-nine million, nine hundred seventy-seven thousand, five hundred twenty-one".