6466125921 has 4 divisors (see below), whose sum is σ = 8621501232. Its totient is φ = 4310750612.

The previous prime is 6466125871. The next prime is 6466125929. The reversal of 6466125921 is 1295216646.

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 6466125921 - 2⁶ = 6466125857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6466125929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077687651 + ... + 1077687656.

It is an arithmetic number, because the mean of its divisors is an integer number (2155375308).

Almost surely, 2^6466125921 is an apocalyptic number.

It is an amenable number.

6466125921 is a deficient number, since it is larger than the sum of its proper divisors (2155375311).

6466125921 is a wasteful number, since it uses less digits than its factorization.

6466125921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155375310.

The product of its digits is 155520, while the sum is 42.

The square root of 6466125921 is about 80412.2249474544. The cubic root of 6466125921 is about 1863.0079976169.

The spelling of 6466125921 in words is "six billion, four hundred sixty-six million, one hundred twenty-five thousand, nine hundred twenty-one".