66205975 has 24 divisors (see below), whose sum is σ = 94279680. Its totient is φ = 45612000.

The previous prime is 66205967. The next prime is 66206069. The reversal of 66205975 is 57950266.

It is not a de Polignac number, because 66205975 - 2³ = 66205967 is a prime.

It is a super-2 number, since 2×66205975² = 8766462251401250, which contains 22 as substring.

It is a congruent number.

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, 1111 + ... + 11560.

It is an arithmetic number, because the mean of its divisors is an integer number (3928320).

Almost surely, 2^66205975 is an apocalyptic number.

66205975 is a deficient number, since it is larger than the sum of its proper divisors (28073705).

66205975 is a wasteful number, since it uses less digits than its factorization.

66205975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12711 (or 12706 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 66205975 is about 8136.7054143554. The cubic root of 66205975 is about 404.5439667037.

The spelling of 66205975 in words is "sixty-six million, two hundred five thousand, nine hundred seventy-five".