66354625 has 8 divisors (see below), whose sum is σ = 82810728. Its totient is φ = 53083600.

The previous prime is 66354623. The next prime is 66354643. The reversal of 66354625 is 52645366.

It can be written as a sum of positive squares in 4 ways, for example, as 7187761 + 59166864 = 2681^2 + 7692^2 .

It is not a de Polignac number, because 66354625 - 2¹ = 66354623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66354623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265294 + ... + 265543.

It is an arithmetic number, because the mean of its divisors is an integer number (10351341).

Almost surely, 2^66354625 is an apocalyptic number.

It is an amenable number.

66354625 is a deficient number, since it is larger than the sum of its proper divisors (16456103).

66354625 is an equidigital number, since it uses as much as digits as its factorization.

66354625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530852 (or 530842 counting only the distinct ones).

The product of its digits is 129600, while the sum is 37.

The square root of 66354625 is about 8145.8348252343. The cubic root of 66354625 is about 404.8465099409.

The spelling of 66354625 in words is "sixty-six million, three hundred fifty-four thousand, six hundred twenty-five".