66131469 has 12 divisors (see below), whose sum is σ = 98105436. Its totient is φ = 42895872.

The previous prime is 66131449. The next prime is 66131477. The reversal of 66131469 is 96413166.

66131469 is a `hidden beast` number, since 66 + 131 + 469 = 666.

66131469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30669444 + 35462025 = 5538^2 + 5955^2 .

It is not a de Polignac number, because 66131469 - 2⁷ = 66131341 is a prime.

It is a super-2 number, since 2×66131469² = 8746742384195922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66131449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98964 + ... + 99629.

It is an arithmetic number, because the mean of its divisors is an integer number (8175453).

Almost surely, 2^66131469 is an apocalyptic number.

It is an amenable number.

66131469 is a deficient number, since it is larger than the sum of its proper divisors (31973967).

66131469 is a wasteful number, since it uses less digits than its factorization.

66131469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198636 (or 198633 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 66131469 is about 8132.1257368538. The cubic root of 66131469 is about 404.3921563049.

The spelling of 66131469 in words is "sixty-six million, one hundred thirty-one thousand, four hundred sixty-nine".