66730501 has 4 divisors (see below), whose sum is σ = 67017132. Its totient is φ = 66443872.

The previous prime is 66730487. The next prime is 66730513. The reversal of 66730501 is 10503766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30140100 + 36590401 = 5490^2 + 6049^2 .

It is a cyclic number.

It is not a de Polignac number, because 66730501 - 2¹³ = 66722309 is a prime.

It is a super-2 number, since 2×66730501² = 8905919527422002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66730501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66730571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142966 + ... + 143431.

It is an arithmetic number, because the mean of its divisors is an integer number (16754283).

Almost surely, 2^66730501 is an apocalyptic number.

It is an amenable number.

66730501 is a deficient number, since it is larger than the sum of its proper divisors (286631).

66730501 is a wasteful number, since it uses less digits than its factorization.

66730501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286630.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 66730501 is about 8168.8739126026. The cubic root of 66730501 is about 405.6095095236.

The spelling of 66730501 in words is "sixty-six million, seven hundred thirty thousand, five hundred one".