66747069 has 6 divisors (see below), whose sum is σ = 96412446. Its totient is φ = 44498040.

The previous prime is 66747053. The next prime is 66747073. The reversal of 66747069 is 96074766.

It can be written as a sum of positive squares in only one way, i.e., 57198969 + 9548100 = 7563^2 + 3090^2 .

It is not a de Polignac number, because 66747069 - 2⁴ = 66747053 is a prime.

It is a super-2 number, since 2×66747069² = 8910342440181522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66747089) 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 5 ways as a sum of consecutive naturals, for example, 3708162 + ... + 3708179.

It is an arithmetic number, because the mean of its divisors is an integer number (16068741).

Almost surely, 2^66747069 is an apocalyptic number.

It is an amenable number.

66747069 is a deficient number, since it is larger than the sum of its proper divisors (29665377).

66747069 is a wasteful number, since it uses less digits than its factorization.

66747069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7416347 (or 7416344 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 66747069 is about 8169.8879429280. The cubic root of 66747069 is about 405.6430752952.

The spelling of 66747069 in words is "sixty-six million, seven hundred forty-seven thousand, sixty-nine".