66825729 has 12 divisors (see below), whose sum is σ = 100101456. Its totient is φ = 44550324.

The previous prime is 66825719. The next prime is 66825761. The reversal of 66825729 is 92752866.

It is not a de Polignac number, because 66825729 - 2¹¹ = 66823681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66825709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137259 + ... + 137744.

It is an arithmetic number, because the mean of its divisors is an integer number (8341788).

Almost surely, 2^66825729 is an apocalyptic number.

It is an amenable number.

66825729 is a deficient number, since it is larger than the sum of its proper divisors (33275727).

66825729 is an equidigital number, since it uses as much as digits as its factorization.

66825729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275018 (or 275006 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66825729 is about 8174.7005449741. The cubic root of 66825729 is about 405.8023599835.

The spelling of 66825729 in words is "sixty-six million, eight hundred twenty-five thousand, seven hundred twenty-nine".