66454531 has 24 divisors (see below), whose sum is σ = 79768080. Its totient is φ = 54985920.

The previous prime is 66454529. The next prime is 66454561. The reversal of 66454531 is 13545466.

It is not a de Polignac number, because 66454531 - 2¹ = 66454529 is a prime.

It is a super-2 number, since 2×66454531² = 8832409380859922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66454501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130305 + ... + 130813.

It is an arithmetic number, because the mean of its divisors is an integer number (3323670).

Almost surely, 2^66454531 is an apocalyptic number.

66454531 is a deficient number, since it is larger than the sum of its proper divisors (13313549).

66454531 is a wasteful number, since it uses less digits than its factorization.

66454531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 616 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 66454531 is about 8151.9648551745. The cubic root of 66454531 is about 405.0495920576.

Adding to 66454531 its reverse (13545466), we get a palindrome (79999997).

The spelling of 66454531 in words is "sixty-six million, four hundred fifty-four thousand, five hundred thirty-one".