66487693 has 2 divisors, whose sum is σ = 66487694. Its totient is φ = 66487692.

The previous prime is 66487643. The next prime is 66487709. The reversal of 66487693 is 39678466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43322724 + 23164969 = 6582^2 + 4813^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66487693 is a prime.

It is a super-2 number, since 2×66487693² = 8841226640924498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66487643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33243846 + 33243847.

It is an arithmetic number, because the mean of its divisors is an integer number (33243847).

Almost surely, 2^66487693 is an apocalyptic number.

It is an amenable number.

66487693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66487693 is an equidigital number, since it uses as much as digits as its factorization.

66487693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 49.

The square root of 66487693 is about 8153.9985896491. The cubic root of 66487693 is about 405.1169565181.

It can be divided in two parts, 6648 and 7693, that added together give a palindrome (14341).

The spelling of 66487693 in words is "sixty-six million, four hundred eighty-seven thousand, six hundred ninety-three".