66754013 has 2 divisors, whose sum is σ = 66754014. Its totient is φ = 66754012.

The previous prime is 66754007. The next prime is 66754021. The reversal of 66754013 is 31045766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 770884 = 8123^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 66754013 - 2⁶ = 66753949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66754003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33377006 + 33377007.

It is an arithmetic number, because the mean of its divisors is an integer number (33377007).

Almost surely, 2^66754013 is an apocalyptic number.

It is an amenable number.

66754013 is a deficient number, since it is larger than the sum of its proper divisors (1).

66754013 is an equidigital number, since it uses as much as digits as its factorization.

66754013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66754013 is about 8170.3129071046. The cubic root of 66754013 is about 405.6571417697.

Adding to 66754013 its reverse (31045766), we get a palindrome (97799779).

The spelling of 66754013 in words is "sixty-six million, seven hundred fifty-four thousand, thirteen".