66525543 has 20 divisors (see below), whose sum is σ = 113575440. Its totient is φ = 38014272.

The previous prime is 66525541. The next prime is 66525553. The reversal of 66525543 is 34552566.

It is a happy number.

66525543 is a `hidden beast` number, since 66 + 52 + 5 + 543 = 666.

It is not a de Polignac number, because 66525543 - 2¹ = 66525541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66525498 and 66525507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525541) 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 19 ways as a sum of consecutive naturals, for example, 58098 + ... + 59231.

It is an arithmetic number, because the mean of its divisors is an integer number (5678772).

Almost surely, 2^66525543 is an apocalyptic number.

66525543 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66525543 is a deficient number, since it is larger than the sum of its proper divisors (47049897).

66525543 is a wasteful number, since it uses less digits than its factorization.

66525543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117348 (or 117339 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 66525543 is about 8156.3192066029. The cubic root of 66525543 is about 405.1938166974.

The spelling of 66525543 in words is "sixty-six million, five hundred twenty-five thousand, five hundred forty-three".