66761293 has 2 divisors, whose sum is σ = 66761294. Its totient is φ = 66761292.

The previous prime is 66761263. The next prime is 66761297. The reversal of 66761293 is 39216766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65076489 + 1684804 = 8067^2 + 1298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66761293 is a prime.

It is equal to p_3938539 and since 66761293 and 3938539 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66761297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380646 + 33380647.

It is an arithmetic number, because the mean of its divisors is an integer number (33380647).

Almost surely, 2^66761293 is an apocalyptic number.

It is an amenable number.

66761293 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761293 is an equidigital number, since it uses as much as digits as its factorization.

66761293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 66761293 is about 8170.7584103313. The cubic root of 66761293 is about 405.6718878327.

The spelling of 66761293 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred ninety-three".