66655375 has 16 divisors (see below), whose sum is σ = 85127328. Its totient is φ = 52080000.

The previous prime is 66655339. The next prime is 66655387. The reversal of 66655375 is 57355666.

It is not a de Polignac number, because 66655375 - 2⁷ = 66655247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826 + ... + 11575.

It is an arithmetic number, because the mean of its divisors is an integer number (5320458).

Almost surely, 2^66655375 is an apocalyptic number.

66655375 is a deficient number, since it is larger than the sum of its proper divisors (18471953).

66655375 is a wasteful number, since it uses less digits than its factorization.

66655375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12459 (or 12449 counting only the distinct ones).

The product of its digits is 567000, while the sum is 43.

The square root of 66655375 is about 8164.2743094534. The cubic root of 66655375 is about 405.4572390131.

The spelling of 66655375 in words is "sixty-six million, six hundred fifty-five thousand, three hundred seventy-five".