66625965 has 48 divisors (see below), whose sum is σ = 132657408. Its totient is φ = 30302208.

The previous prime is 66625961. The next prime is 66625973. The reversal of 66625965 is 56952666.

It is not a de Polignac number, because 66625965 - 2² = 66625961 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66625965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66625961) 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, 80544 + ... + 81366.

It is an arithmetic number, because the mean of its divisors is an integer number (2763696).

Almost surely, 2^66625965 is an apocalyptic number.

It is an amenable number.

66625965 is a deficient number, since it is larger than the sum of its proper divisors (66031443).

66625965 is a wasteful number, since it uses less digits than its factorization.

66625965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 1095 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 66625965 is about 8162.4729708588. The cubic root of 66625965 is about 405.3975976532.

The spelling of 66625965 in words is "sixty-six million, six hundred twenty-five thousand, nine hundred sixty-five".