66019638287 has 2 divisors, whose sum is σ = 66019638288. Its totient is φ = 66019638286.

The previous prime is 66019638283. The next prime is 66019638301. The reversal of 66019638287 is 78283691066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66019638287 - 2² = 66019638283 is a prime.

It is a super-4 number, since 4×66019638287⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66019638283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33009819143 + 33009819144.

It is an arithmetic number, because the mean of its divisors is an integer number (33009819144).

Almost surely, 2^66019638287 is an apocalyptic number.

66019638287 is a deficient number, since it is larger than the sum of its proper divisors (1).

66019638287 is an equidigital number, since it uses as much as digits as its factorization.

66019638287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 66019638287 in words is "sixty-six billion, nineteen million, six hundred thirty-eight thousand, two hundred eighty-seven".