66664125 has 48 divisors (see below), whose sum is σ = 131122368. Its totient is φ = 32316000.

The previous prime is 66664109. The next prime is 66664133. The reversal of 66664125 is 52146666.

It is a happy number.

It is not a de Polignac number, because 66664125 - 2⁴ = 66664109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66664125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9682 + ... + 15068.

It is an arithmetic number, because the mean of its divisors is an integer number (2731716).

Almost surely, 2^66664125 is an apocalyptic number.

It is an amenable number.

66664125 is a deficient number, since it is larger than the sum of its proper divisors (64458243).

66664125 is a wasteful number, since it uses less digits than its factorization.

66664125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419 (or 5406 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66664125 is about 8164.8101631330. The cubic root of 66664125 is about 405.4749799960.

It can be divided in two parts, 666641 and 25, that added together give a palindrome (666666).

The spelling of 66664125 in words is "sixty-six million, six hundred sixty-four thousand, one hundred twenty-five".