66986925 has 24 divisors (see below), whose sum is σ = 115569984. Its totient is φ = 34172160.

The previous prime is 66986921. The next prime is 66986929. The reversal of 66986925 is 52968966.

It is an interprime number because it is at equal distance from previous prime (66986921) and next prime (66986929).

It is not a de Polignac number, because 66986925 - 2² = 66986921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986921) 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 23 ways as a sum of consecutive naturals, for example, 17692 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (4815416).

Almost surely, 2^66986925 is an apocalyptic number.

It is an amenable number.

66986925 is a deficient number, since it is larger than the sum of its proper divisors (48583059).

66986925 is a wasteful number, since it uses less digits than its factorization.

66986925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38869 (or 38864 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 66986925 is about 8184.5540501606. The cubic root of 66986925 is about 406.1283880564.

The spelling of 66986925 in words is "sixty-six million, nine hundred eighty-six thousand, nine hundred twenty-five".