66775239 has 8 divisors (see below), whose sum is σ = 98926320. Its totient is φ = 44516808.

The previous prime is 66775223. The next prime is 66775273. The reversal of 66775239 is 93257766.

It is not a de Polignac number, because 66775239 - 2⁴ = 66775223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66775194 and 66775203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66775339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1236552 + ... + 1236605.

It is an arithmetic number, because the mean of its divisors is an integer number (12365790).

Almost surely, 2^66775239 is an apocalyptic number.

66775239 is a deficient number, since it is larger than the sum of its proper divisors (32151081).

66775239 is a wasteful number, since it uses less digits than its factorization.

66775239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473166 (or 2473160 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 66775239 is about 8171.6117749193. The cubic root of 66775239 is about 405.7001332725.

The spelling of 66775239 in words is "sixty-six million, seven hundred seventy-five thousand, two hundred thirty-nine".