66500525 has 24 divisors (see below), whose sum is σ = 101493504. Its totient is φ = 42091200.

The previous prime is 66500503. The next prime is 66500543. The reversal of 66500525 is 52500566.

It is not a de Polignac number, because 66500525 - 2¹² = 66496429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12341 + ... + 16890.

It is an arithmetic number, because the mean of its divisors is an integer number (4228896).

Almost surely, 2^66500525 is an apocalyptic number.

66500525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66500525 is a deficient number, since it is larger than the sum of its proper divisors (34992979).

66500525 is a wasteful number, since it uses less digits than its factorization.

66500525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29261 (or 29256 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 66500525 is about 8154.7854049018. The cubic root of 66500525 is about 405.1430171124.

The spelling of 66500525 in words is "sixty-six million, five hundred thousand, five hundred twenty-five".