66775025 has 24 divisors (see below), whose sum is σ = 87658080. Its totient is φ = 50319360.

The previous prime is 66775013. The next prime is 66775043. The reversal of 66775025 is 52057766.

It is not a de Polignac number, because 66775025 - 2¹⁸ = 66512881 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66775025.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 121802 + ... + 122348.

It is an arithmetic number, because the mean of its divisors is an integer number (3652420).

Almost surely, 2^66775025 is an apocalyptic number.

It is an amenable number.

66775025 is a deficient number, since it is larger than the sum of its proper divisors (20883055).

66775025 is a wasteful number, since it uses less digits than its factorization.

66775025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 66775025 is about 8171.5986807968. The cubic root of 66775025 is about 405.6996998788.

The spelling of 66775025 in words is "sixty-six million, seven hundred seventy-five thousand, twenty-five".