66601511 has 2 divisors, whose sum is σ = 66601512. Its totient is φ = 66601510.

The previous prime is 66601499. The next prime is 66601523. The reversal of 66601511 is 11510666.

66601511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (66601499) and next prime (66601523).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66601511 is a prime.

It is a super-2 number, since 2×66601511² = 8871522534966242, which contains 22 as substring.

It is a Sophie Germain 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 (66601111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300755 + 33300756.

It is an arithmetic number, because the mean of its divisors is an integer number (33300756).

Almost surely, 2^66601511 is an apocalyptic number.

66601511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66601511 is an equidigital number, since it uses as much as digits as its factorization.

66601511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66601511 is about 8160.9748804907. The cubic root of 66601511 is about 405.3479933387.

The spelling of 66601511 in words is "sixty-six million, six hundred one thousand, five hundred eleven".