66526013 has 2 divisors, whose sum is σ = 66526014. Its totient is φ = 66526012.

The previous prime is 66526003. The next prime is 66526039. The reversal of 66526013 is 31062566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64995844 + 1530169 = 8062^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 66526013 - 2⁸ = 66525757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66526003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33263006 + 33263007.

It is an arithmetic number, because the mean of its divisors is an integer number (33263007).

Almost surely, 2^66526013 is an apocalyptic number.

It is an amenable number.

66526013 is a deficient number, since it is larger than the sum of its proper divisors (1).

66526013 is an equidigital number, since it uses as much as digits as its factorization.

66526013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66526013 is about 8156.3480185681. The cubic root of 66526013 is about 405.1947709205.

Adding to 66526013 its reverse (31062566), we get a palindrome (97588579).

The spelling of 66526013 in words is "sixty-six million, five hundred twenty-six thousand, thirteen".