66437983 has 2 divisors, whose sum is σ = 66437984. Its totient is φ = 66437982.

The previous prime is 66437951. The next prime is 66437993. The reversal of 66437983 is 38973466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66437983 - 2⁵ = 66437951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66437923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33218991 + 33218992.

It is an arithmetic number, because the mean of its divisors is an integer number (33218992).

Almost surely, 2^66437983 is an apocalyptic number.

66437983 is a deficient number, since it is larger than the sum of its proper divisors (1).

66437983 is an equidigital number, since it uses as much as digits as its factorization.

66437983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 46.

The square root of 66437983 is about 8150.9498219533. The cubic root of 66437983 is about 405.0159684808.

The spelling of 66437983 in words is "sixty-six million, four hundred thirty-seven thousand, nine hundred eighty-three".