66493831 has 2 divisors, whose sum is σ = 66493832. Its totient is φ = 66493830.

The previous prime is 66493811. The next prime is 66493837. The reversal of 66493831 is 13839466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66493831 - 2⁵ = 66493799 is a prime.

It is a super-2 number, since 2×66493831² = 8842859122113122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66493837) 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, 33246915 + 33246916.

It is an arithmetic number, because the mean of its divisors is an integer number (33246916).

Almost surely, 2^66493831 is an apocalyptic number.

66493831 is a deficient number, since it is larger than the sum of its proper divisors (1).

66493831 is an equidigital number, since it uses as much as digits as its factorization.

66493831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 66493831 is about 8154.3749607189. The cubic root of 66493831 is about 405.1294226415.

The spelling of 66493831 in words is "sixty-six million, four hundred ninety-three thousand, eight hundred thirty-one".