66665375 has 32 divisors (see below), whose sum is σ = 96720000. Its totient is φ = 44928000.

The previous prime is 66665371. The next prime is 66665383. The reversal of 66665375 is 57356666.

It is not a de Polignac number, because 66665375 - 2² = 66665371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52751 + ... + 53999.

It is an arithmetic number, because the mean of its divisors is an integer number (3022500).

Almost surely, 2^66665375 is an apocalyptic number.

66665375 is a deficient number, since it is larger than the sum of its proper divisors (30054625).

66665375 is a wasteful number, since it uses less digits than its factorization.

66665375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 1322 counting only the distinct ones).

The product of its digits is 680400, while the sum is 44.

The square root of 66665375 is about 8164.8867107878. The cubic root of 66665375 is about 405.4775142955.

The spelling of 66665375 in words is "sixty-six million, six hundred sixty-five thousand, three hundred seventy-five".