66443434465 has 32 divisors (see below), whose sum is σ = 81829440000. Its totient is φ = 51768450048.

The previous prime is 66443434441. The next prime is 66443434469. The reversal of 66443434465 is 56443434466.

It is not a de Polignac number, because 66443434465 - 2²³ = 66435045857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66443434469) 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, 63339261 + ... + 63340309.

It is an arithmetic number, because the mean of its divisors is an integer number (2557170000).

Almost surely, 2^66443434465 is an apocalyptic number.

It is an amenable number.

66443434465 is a deficient number, since it is larger than the sum of its proper divisors (15386005535).

66443434465 is a wasteful number, since it uses less digits than its factorization.

66443434465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169.

The product of its digits is 9953280, while the sum is 49.

Subtracting from 66443434465 its reverse (56443434466), we obtain a palindrome (9999999999).

The spelling of 66443434465 in words is "sixty-six billion, four hundred forty-three million, four hundred thirty-four thousand, four hundred sixty-five".