66703919 has 2 divisors, whose sum is σ = 66703920. Its totient is φ = 66703918.

The previous prime is 66703913. The next prime is 66703957. The reversal of 66703919 is 91930766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66703919 is a prime.

It is a super-2 number, since 2×66703919² = 8898825619917122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66703913) 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, 33351959 + 33351960.

It is an arithmetic number, because the mean of its divisors is an integer number (33351960).

Almost surely, 2^66703919 is an apocalyptic number.

66703919 is a deficient number, since it is larger than the sum of its proper divisors (1).

66703919 is an equidigital number, since it uses as much as digits as its factorization.

66703919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 66703919 is about 8167.2467208968. The cubic root of 66703919 is about 405.5556443805. Note that the first 3 decimals are identical.

The spelling of 66703919 in words is "sixty-six million, seven hundred three thousand, nine hundred nineteen".