66493637 has 8 divisors (see below), whose sum is σ = 77544000. Its totient is φ = 56994252.

The previous prime is 66493631. The next prime is 66493657. The reversal of 66493637 is 73639466.

It is not a de Polignac number, because 66493637 - 2¹² = 66489541 is a prime.

It is a super-2 number, since 2×66493637² = 8842807522975538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66493631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96587 + ... + 97272.

It is an arithmetic number, because the mean of its divisors is an integer number (9693000).

Almost surely, 2^66493637 is an apocalyptic number.

It is an amenable number.

66493637 is a deficient number, since it is larger than the sum of its proper divisors (11050363).

66493637 is an equidigital number, since it uses as much as digits as its factorization.

66493637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193880 (or 193866 counting only the distinct ones).

The product of its digits is 489888, while the sum is 44.

The square root of 66493637 is about 8154.3630652553. The cubic root of 66493637 is about 405.1290286441.

The spelling of 66493637 in words is "sixty-six million, four hundred ninety-three thousand, six hundred thirty-seven".