6466666591 has 32 divisors (see below), whose sum is σ = 8460288000. Its totient is φ = 4792714080.

The previous prime is 6466666579. The next prime is 6466666607. The reversal of 6466666591 is 1956666646.

It is not a de Polignac number, because 6466666591 - 2⁷ = 6466666463 is a prime.

It is a super-2 number, since 2×6466666591² = 83635553598311122562, 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 (6466666291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306810 + ... + 327208.

It is an arithmetic number, because the mean of its divisors is an integer number (264384000).

Almost surely, 2^6466666591 is an apocalyptic number.

6466666591 is a deficient number, since it is larger than the sum of its proper divisors (1993621409).

6466666591 is a wasteful number, since it uses less digits than its factorization.

6466666591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20619.

The product of its digits is 8398080, while the sum is 55.

The square root of 6466666591 is about 80415.5867416262. The cubic root of 6466666591 is about 1863.0599217764.

Adding to 6466666591 its sum of digits (55), we get a palindrome (6466666646).

The spelling of 6466666591 in words is "six billion, four hundred sixty-six million, six hundred sixty-six thousand, five hundred ninety-one".