66423725 has 6 divisors (see below), whose sum is σ = 82365450. Its totient is φ = 53138960.

The previous prime is 66423719. The next prime is 66423739. The reversal of 66423725 is 52732466.

It can be written as a sum of positive squares in 3 ways, for example, as 23639044 + 42784681 = 4862^2 + 6541^2 .

It is not a de Polignac number, because 66423725 - 2¹⁶ = 66358189 is a prime.

It is a super-2 number, since 2×66423725² = 8824222485751250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1328450 + ... + 1328499.

It is an arithmetic number, because the mean of its divisors is an integer number (13727575).

Almost surely, 2^66423725 is an apocalyptic number.

It is an amenable number.

66423725 is a deficient number, since it is larger than the sum of its proper divisors (15941725).

66423725 is a wasteful number, since it uses less digits than its factorization.

66423725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656959 (or 2656954 counting only the distinct ones).

The product of its digits is 60480, while the sum is 35.

The square root of 66423725 is about 8150.0751530277. The cubic root of 66423725 is about 404.9869934349.

It can be divided in two parts, 664 and 23725, that added together give a cube (24389 = 29³).

The spelling of 66423725 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred twenty-five".