66811465 has 32 divisors (see below), whose sum is σ = 94887936. Its totient is φ = 44210880.

The previous prime is 66811463. The next prime is 66811471. The reversal of 66811465 is 56411866.

It is not a de Polignac number, because 66811465 - 2¹ = 66811463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66811463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154800 + ... + 155230.

It is an arithmetic number, because the mean of its divisors is an integer number (2965248).

Almost surely, 2^66811465 is an apocalyptic number.

It is an amenable number.

66811465 is a deficient number, since it is larger than the sum of its proper divisors (28076471).

66811465 is a wasteful number, since it uses less digits than its factorization.

66811465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its digits is 34560, while the sum is 37.

The square root of 66811465 is about 8173.8280505526. The cubic root of 66811465 is about 405.7734849936.

It can be divided in two parts, 66811 and 465, that added together give a palindrome (67276).

The spelling of 66811465 in words is "sixty-six million, eight hundred eleven thousand, four hundred sixty-five".