66135745 has 8 divisors (see below), whose sum is σ = 85467816. Its totient is φ = 48838656.

The previous prime is 66135703. The next prime is 66135749. The reversal of 66135745 is 54753166.

66135745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 66048129 = 296^2 + 8127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66135745 - 2⁹ = 66135233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66135749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508672 + ... + 508801.

It is an arithmetic number, because the mean of its divisors is an integer number (10683477).

Almost surely, 2^66135745 is an apocalyptic number.

66135745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66135745 is a deficient number, since it is larger than the sum of its proper divisors (19332071).

66135745 is a wasteful number, since it uses less digits than its factorization.

66135745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017491.

The product of its digits is 75600, while the sum is 37.

The square root of 66135745 is about 8132.3886404918. The cubic root of 66135745 is about 404.4008719921.

The spelling of 66135745 in words is "sixty-six million, one hundred thirty-five thousand, seven hundred forty-five".