66738525 has 48 divisors (see below), whose sum is σ = 131610624. Its totient is φ = 29177280.

The previous prime is 66738517. The next prime is 66738563. The reversal of 66738525 is 52583766.

It is not a de Polignac number, because 66738525 - 2³ = 66738517 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 9312 + ... + 14838.

It is an arithmetic number, because the mean of its divisors is an integer number (2741888).

Almost surely, 2^66738525 is an apocalyptic number.

It is an amenable number.

66738525 is a deficient number, since it is larger than the sum of its proper divisors (64872099).

66738525 is a wasteful number, since it uses less digits than its factorization.

66738525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5570 (or 5565 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 66738525 is about 8169.3650304047. The cubic root of 66738525 is about 405.6257663587.

The spelling of 66738525 in words is "sixty-six million, seven hundred thirty-eight thousand, five hundred twenty-five".