66578925 has 48 divisors (see below), whose sum is σ = 130170240. Its totient is φ = 29379840.

The previous prime is 66578923. The next prime is 66578927. The reversal of 66578925 is 52987566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66578923) and next prime (66578927).

It is not a de Polignac number, because 66578925 - 2¹ = 66578923 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66578923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13039 + ... + 17411.

It is an arithmetic number, because the mean of its divisors is an integer number (2711880).

Almost surely, 2^66578925 is an apocalyptic number.

It is an amenable number.

66578925 is a deficient number, since it is larger than the sum of its proper divisors (63591315).

66578925 is a wasteful number, since it uses less digits than its factorization.

66578925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422 (or 4417 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 66578925 is about 8159.5909823961. The cubic root of 66578925 is about 405.3021674270.

The spelling of 66578925 in words is "sixty-six million, five hundred seventy-eight thousand, nine hundred twenty-five".