66983731 has 2 divisors, whose sum is σ = 66983732. Its totient is φ = 66983730.

The previous prime is 66983729. The next prime is 66983753. The reversal of 66983731 is 13738966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66983731 - 2¹ = 66983729 is a prime.

It is a super-2 number, since 2×66983731² = 8973640437360722, which contains 22 as substring.

Together with 66983729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66983701) 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, 33491865 + 33491866.

It is an arithmetic number, because the mean of its divisors is an integer number (33491866).

Almost surely, 2^66983731 is an apocalyptic number.

66983731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66983731 is an equidigital number, since it uses as much as digits as its factorization.

66983731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 66983731 is about 8184.3589241919. The cubic root of 66983731 is about 406.1219330918.

The spelling of 66983731 in words is "sixty-six million, nine hundred eighty-three thousand, seven hundred thirty-one".