66969751 has 2 divisors, whose sum is σ = 66969752. Its totient is φ = 66969750.

The previous prime is 66969731. The next prime is 66969761. The reversal of 66969751 is 15796966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66969751 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66969695 and 66969704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66969731) 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, 33484875 + 33484876.

It is an arithmetic number, because the mean of its divisors is an integer number (33484876).

Almost surely, 2^66969751 is an apocalyptic number.

66969751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66969751 is an equidigital number, since it uses as much as digits as its factorization.

66969751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 49.

The square root of 66969751 is about 8183.5048115096. The cubic root of 66969751 is about 406.0936775758.

The spelling of 66969751 in words is "sixty-six million, nine hundred sixty-nine thousand, seven hundred fifty-one".