66293681 has 8 divisors (see below), whose sum is σ = 69038400. Its totient is φ = 63579600.

The previous prime is 66293657. The next prime is 66293701. The reversal of 66293681 is 18639266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66293681 - 2¹⁴ = 66277297 is a prime.

It is a super-2 number, since 2×66293681² = 8789704281059522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66293651) 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 in 7 ways as a sum of consecutive naturals, for example, 3191 + ... + 11948.

It is an arithmetic number, because the mean of its divisors is an integer number (8629800).

Almost surely, 2^66293681 is an apocalyptic number.

It is an amenable number.

66293681 is a deficient number, since it is larger than the sum of its proper divisors (2744719).

66293681 is a wasteful number, since it uses less digits than its factorization.

66293681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15319.

The product of its digits is 93312, while the sum is 41.

The square root of 66293681 is about 8142.0931583961. The cubic root of 66293681 is about 404.7225270070.

The spelling of 66293681 in words is "sixty-six million, two hundred ninety-three thousand, six hundred eighty-one".