66624417425 has 12 divisors (see below), whose sum is σ = 82650566796. Its totient is φ = 53276121600.

The previous prime is 66624417407. The next prime is 66624417427. The reversal of 66624417425 is 52471442666.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3846108289 + 62778309136 = 62017^2 + 250556^2 .

It is not a de Polignac number, because 66624417425 - 2⁶ = 66624417361 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66624417425.

It is not an unprimeable number, because it can be changed into a prime (66624417427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 527144 + ... + 641193.

It is an arithmetic number, because the mean of its divisors is an integer number (6887547233).

Almost surely, 2^66624417425 is an apocalyptic number.

It is an amenable number.

66624417425 is a deficient number, since it is larger than the sum of its proper divisors (16026149371).

66624417425 is a wasteful number, since it uses less digits than its factorization.

66624417425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170628 (or 1170623 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 47.

The spelling of 66624417425 in words is "sixty-six billion, six hundred twenty-four million, four hundred seventeen thousand, four hundred twenty-five".