6646430452511 has 4 divisors (see below), whose sum is σ = 6646437237552. Its totient is φ = 6646423667472.

The previous prime is 6646430452499. The next prime is 6646430452513. The reversal of 6646430452511 is 1152540346466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6646430452511 - 2³⁴ = 6629250583327 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 (6646430452513) 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, 1611491 + ... + 3986196.

It is an arithmetic number, because the mean of its divisors is an integer number (1661609309388).

Almost surely, 2^{6646430452511} is an apocalyptic number.

6646430452511 is a deficient number, since it is larger than the sum of its proper divisors (6785041).

6646430452511 is a wasteful number, since it uses less digits than its factorization.

6646430452511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6785040.

The product of its (nonzero) digits is 2073600, while the sum is 47.

Adding to 6646430452511 its reverse (1152540346466), we get a palindrome (7798970798977).

The spelling of 6646430452511 in words is "six trillion, six hundred forty-six billion, four hundred thirty million, four hundred fifty-two thousand, five hundred eleven".