66995025 has 24 divisors (see below), whose sum is σ = 113471904. Its totient is φ = 34857600.

The previous prime is 66995009. The next prime is 66995039. The reversal of 66995025 is 52059966.

It is not a de Polignac number, because 66995025 - 2⁴ = 66995009 is a prime.

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, 7819 + ... + 13968.

It is an arithmetic number, because the mean of its divisors is an integer number (4727996).

Almost surely, 2^66995025 is an apocalyptic number.

It is an amenable number.

66995025 is a deficient number, since it is larger than the sum of its proper divisors (46476879).

66995025 is a wasteful number, since it uses less digits than its factorization.

66995025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21841 (or 21836 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 66995025 is about 8185.0488697380. The cubic root of 66995025 is about 406.1447569590.

The spelling of 66995025 in words is "sixty-six million, nine hundred ninety-five thousand, twenty-five".