6640404511 has 8 divisors (see below), whose sum is σ = 7272412560. Its totient is φ = 6025711872.

The previous prime is 6640404499. The next prime is 6640404521. The reversal of 6640404511 is 1154040466.

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 6640404511 - 2²¹ = 6638307359 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 (6640404521) 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, 4328050 + ... + 4329583.

It is an arithmetic number, because the mean of its divisors is an integer number (909051570).

Almost surely, 2^6640404511 is an apocalyptic number.

6640404511 is a deficient number, since it is larger than the sum of its proper divisors (632008049).

6640404511 is a wasteful number, since it uses less digits than its factorization.

6640404511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8657705.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 6640404511 is about 81488.6771950558. The cubic root of 6640404511 is about 1879.5974420068.

Adding to 6640404511 its reverse (1154040466), we get a palindrome (7794444977).

The spelling of 6640404511 in words is "six billion, six hundred forty million, four hundred four thousand, five hundred eleven".