66608951 has 2 divisors, whose sum is σ = 66608952. Its totient is φ = 66608950.

The previous prime is 66608909. The next prime is 66608957. The reversal of 66608951 is 15980666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66608951 - 2²² = 62414647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66608899 and 66608908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66608957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33304475 + 33304476.

It is an arithmetic number, because the mean of its divisors is an integer number (33304476).

Almost surely, 2^66608951 is an apocalyptic number.

66608951 is a deficient number, since it is larger than the sum of its proper divisors (1).

66608951 is an equidigital number, since it uses as much as digits as its factorization.

66608951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 66608951 is about 8161.4306956562. The cubic root of 66608951 is about 405.3630864736.

The spelling of 66608951 in words is "sixty-six million, six hundred eight thousand, nine hundred fifty-one".