6640450511 has 8 divisors (see below), whose sum is σ = 6894286464. Its totient is φ = 6389091360.

The previous prime is 6640450493. The next prime is 6640450513. The reversal of 6640450511 is 1150540466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640450511 - 2²⁶ = 6573341647 is a prime.

It is a super-2 number, since 2×6640450511² = 88191165978080322242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640450513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613736 + ... + 624461.

It is an arithmetic number, because the mean of its divisors is an integer number (861785808).

Almost surely, 2^6640450511 is an apocalyptic number.

6640450511 is a deficient number, since it is larger than the sum of its proper divisors (253835953).

6640450511 is a wasteful number, since it uses less digits than its factorization.

6640450511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238401.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 6640450511 is about 81488.9594423686. The cubic root of 6640450511 is about 1879.6017821682.

Adding to 6640450511 its reverse (1150540466), we get a palindrome (7790990977).

The spelling of 6640450511 in words is "six billion, six hundred forty million, four hundred fifty thousand, five hundred eleven".