66137925 has 48 divisors (see below), whose sum is σ = 125706240. Its totient is φ = 30056640.

The previous prime is 66137923. The next prime is 66137957. The reversal of 66137925 is 52973166.

It is not a de Polignac number, because 66137925 - 2¹ = 66137923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137923) 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, 137836 + ... + 138314.

It is an arithmetic number, because the mean of its divisors is an integer number (2618880).

Almost surely, 2^66137925 is an apocalyptic number.

It is an amenable number.

66137925 is a deficient number, since it is larger than the sum of its proper divisors (59568315).

66137925 is a wasteful number, since it uses less digits than its factorization.

66137925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 757 counting only the distinct ones).

The product of its digits is 68040, while the sum is 39.

The square root of 66137925 is about 8132.5226713487. The cubic root of 66137925 is about 404.4053152989.

The spelling of 66137925 in words is "sixty-six million, one hundred thirty-seven thousand, nine hundred twenty-five".