66502745 has 12 divisors (see below), whose sum is σ = 80485740. Its totient is φ = 52750080.

The previous prime is 66502741. The next prime is 66502763. The reversal of 66502745 is 54720566.

It can be written as a sum of positive squares in 6 ways, for example, as 12759184 + 53743561 = 3572^2 + 7331^2 .

It is not a de Polignac number, because 66502745 - 2² = 66502741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66502741) 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, 275825 + ... + 276065.

It is an arithmetic number, because the mean of its divisors is an integer number (6707145).

Almost surely, 2^66502745 is an apocalyptic number.

It is an amenable number.

66502745 is a deficient number, since it is larger than the sum of its proper divisors (13982995).

66502745 is an equidigital number, since it uses as much as digits as its factorization.

66502745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 66502745 is about 8154.9215201619. The cubic root of 66502745 is about 405.1475253850.

The spelling of 66502745 in words is "sixty-six million, five hundred two thousand, seven hundred forty-five".