66947753 has 2 divisors, whose sum is σ = 66947754. Its totient is φ = 66947752.

The previous prime is 66947743. The next prime is 66947761. The reversal of 66947753 is 35774966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52301824 + 14645929 = 7232^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 66947753 - 2¹⁰ = 66946729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66947698 and 66947707.

It is not a weakly prime, because it can be changed into another prime (66947723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33473876 + 33473877.

It is an arithmetic number, because the mean of its divisors is an integer number (33473877).

Almost surely, 2^66947753 is an apocalyptic number.

It is an amenable number.

66947753 is a deficient number, since it is larger than the sum of its proper divisors (1).

66947753 is an equidigital number, since it uses as much as digits as its factorization.

66947753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 47.

The square root of 66947753 is about 8182.1606559637. The cubic root of 66947753 is about 406.0492086084.

The spelling of 66947753 in words is "sixty-six million, nine hundred forty-seven thousand, seven hundred fifty-three".