66909125 has 8 divisors (see below), whose sum is σ = 83502744. Its totient is φ = 53527200.

The previous prime is 66909103. The next prime is 66909163. The reversal of 66909125 is 52190966.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 66863329 = 214^2 + 8177^2 .

It is not a de Polignac number, because 66909125 - 2⁸ = 66908869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267512 + ... + 267761.

It is an arithmetic number, because the mean of its divisors is an integer number (10437843).

Almost surely, 2^66909125 is an apocalyptic number.

It is an amenable number.

66909125 is a deficient number, since it is larger than the sum of its proper divisors (16593619).

66909125 is an equidigital number, since it uses as much as digits as its factorization.

66909125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535288 (or 535278 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 66909125 is about 8179.7998141764. The cubic root of 66909125 is about 405.9710985113.

The spelling of 66909125 in words is "sixty-six million, nine hundred nine thousand, one hundred twenty-five".