66850025 has 12 divisors (see below), whose sum is σ = 90430224. Its totient is φ = 48618000.

The previous prime is 66849949. The next prime is 66850073. The reversal of 66850025 is 52005866.

It is a happy number.

It is not a de Polignac number, because 66850025 - 2¹⁰ = 66849001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66849973 and 66850000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121271 + ... + 121820.

It is an arithmetic number, because the mean of its divisors is an integer number (7535852).

Almost surely, 2^66850025 is an apocalyptic number.

It is an amenable number.

66850025 is a deficient number, since it is larger than the sum of its proper divisors (23580199).

66850025 is a wasteful number, since it uses less digits than its factorization.

66850025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243112 (or 243107 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 66850025 is about 8176.1864582457. The cubic root of 66850025 is about 405.8515335561.

The spelling of 66850025 in words is "sixty-six million, eight hundred fifty thousand, twenty-five".