66254531 has 16 divisors (see below), whose sum is σ = 80456640. Its totient is φ = 53343360.

The previous prime is 66254521. The next prime is 66254557. The reversal of 66254531 is 13545266.

It is a de Polignac number, because none of the positive numbers 2^k-66254531 is a prime.

It is a super-2 number, since 2×66254531² = 8779325756059922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66254521) 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 15 ways as a sum of consecutive naturals, for example, 3101 + ... + 11921.

It is an arithmetic number, because the mean of its divisors is an integer number (5028540).

Almost surely, 2^66254531 is an apocalyptic number.

66254531 is a deficient number, since it is larger than the sum of its proper divisors (14202109).

66254531 is a wasteful number, since it uses less digits than its factorization.

66254531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8894.

The product of its digits is 21600, while the sum is 32.

The square root of 66254531 is about 8139.6886304084. The cubic root of 66254531 is about 404.6428411465.

Adding to 66254531 its reverse (13545266), we get a palindrome (79799797).

The spelling of 66254531 in words is "sixty-six million, two hundred fifty-four thousand, five hundred thirty-one".