66403425 has 24 divisors (see below), whose sum is σ = 119769120. Its totient is φ = 32195200.

The previous prime is 66403409. The next prime is 66403439. The reversal of 66403425 is 52430466.

It is not a de Polignac number, because 66403425 - 2⁴ = 66403409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66403392 and 66403401.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39420 + ... + 41069.

It is an arithmetic number, because the mean of its divisors is an integer number (4990380).

Almost surely, 2^66403425 is an apocalyptic number.

It is an amenable number.

66403425 is a deficient number, since it is larger than the sum of its proper divisors (53365695).

66403425 is a wasteful number, since it uses less digits than its factorization.

66403425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80513 (or 80508 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 66403425 is about 8148.8296705723. The cubic root of 66403425 is about 404.9457327075.

The spelling of 66403425 in words is "sixty-six million, four hundred three thousand, four hundred twenty-five".