66681341 has 4 divisors (see below), whose sum is σ = 68832384. Its totient is φ = 64530300.

The previous prime is 66681337. The next prime is 66681343. The reversal of 66681341 is 14318666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66681341 - 2² = 66681337 is a prime.

It is a super-3 number, since 3×66681341³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075475 + ... + 1075536.

It is an arithmetic number, because the mean of its divisors is an integer number (17208096).

Almost surely, 2^66681341 is an apocalyptic number.

It is an amenable number.

66681341 is a deficient number, since it is larger than the sum of its proper divisors (2151043).

66681341 is a wasteful number, since it uses less digits than its factorization.

66681341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151042.

The product of its digits is 20736, while the sum is 35.

The square root of 66681341 is about 8165.8643755576. The cubic root of 66681341 is about 405.5098816088.

The spelling of 66681341 in words is "sixty-six million, six hundred eighty-one thousand, three hundred forty-one".