66501377 has 2 divisors, whose sum is σ = 66501378. Its totient is φ = 66501376.

The previous prime is 66501367. The next prime is 66501389. The reversal of 66501377 is 77310566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 10491121 = 7484^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 66501377 - 2¹⁰ = 66500353 is a prime.

It is a super-2 number, since 2×66501377² = 8844866285792258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66501367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250688 + 33250689.

It is an arithmetic number, because the mean of its divisors is an integer number (33250689).

Almost surely, 2^66501377 is an apocalyptic number.

It is an amenable number.

66501377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501377 is an equidigital number, since it uses as much as digits as its factorization.

66501377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 66501377 is about 8154.8376440000. The cubic root of 66501377 is about 405.1447473262.

The spelling of 66501377 in words is "sixty-six million, five hundred one thousand, three hundred seventy-seven".