66136957 has 2 divisors, whose sum is σ = 66136958. Its totient is φ = 66136956.

The previous prime is 66136927. The next prime is 66136963. The reversal of 66136957 is 75963166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65108761 + 1028196 = 8069^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 66136957 - 2¹⁵ = 66104189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66136927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33068478 + 33068479.

It is an arithmetic number, because the mean of its divisors is an integer number (33068479).

Almost surely, 2^66136957 is an apocalyptic number.

It is an amenable number.

66136957 is a deficient number, since it is larger than the sum of its proper divisors (1).

66136957 is an equidigital number, since it uses as much as digits as its factorization.

66136957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 66136957 is about 8132.4631570023. The cubic root of 66136957 is about 404.4033423196.

The spelling of 66136957 in words is "sixty-six million, one hundred thirty-six thousand, nine hundred fifty-seven".