66650053 has 4 divisors (see below), whose sum is σ = 67399020. Its totient is φ = 65901088.

The previous prime is 66650029. The next prime is 66650057. The reversal of 66650053 is 35005666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35005666 = 2 ⋅17502833.

It can be written as a sum of positive squares in 2 ways, for example, as 4524129 + 62125924 = 2127^2 + 7882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66650053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66649997 and 66650024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650057) 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 3 ways as a sum of consecutive naturals, for example, 374350 + ... + 374527.

It is an arithmetic number, because the mean of its divisors is an integer number (16849755).

Almost surely, 2^66650053 is an apocalyptic number.

It is an amenable number.

66650053 is a deficient number, since it is larger than the sum of its proper divisors (748967).

66650053 is an equidigital number, since it uses as much as digits as its factorization.

66650053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748966.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 66650053 is about 8163.9483707334. The cubic root of 66650053 is about 405.4464476810.

The spelling of 66650053 in words is "sixty-six million, six hundred fifty thousand, fifty-three".