66243763 has 2 divisors, whose sum is σ = 66243764. Its totient is φ = 66243762.

The previous prime is 66243739. The next prime is 66243767. The reversal of 66243763 is 36734266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66243763 - 2⁹ = 66243251 is a prime.

It is a super-2 number, since 2×66243763² = 8776472272800338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66243767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33121881 + 33121882.

It is an arithmetic number, because the mean of its divisors is an integer number (33121882).

Almost surely, 2^66243763 is an apocalyptic number.

66243763 is a deficient number, since it is larger than the sum of its proper divisors (1).

66243763 is an equidigital number, since it uses as much as digits as its factorization.

66243763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 37.

The square root of 66243763 is about 8139.0271531676. The cubic root of 66243763 is about 404.6209184689.

The spelling of 66243763 in words is "sixty-six million, two hundred forty-three thousand, seven hundred sixty-three".