66849761 has 8 divisors (see below), whose sum is σ = 73165248. Its totient is φ = 60574000.

The previous prime is 66849751. The next prime is 66849791. The reversal of 66849761 is 16794866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66849761 - 2⁶ = 66849697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66849751) 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, 6350 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (9145656).

Almost surely, 2^66849761 is an apocalyptic number.

It is an amenable number.

66849761 is a deficient number, since it is larger than the sum of its proper divisors (6315487).

66849761 is a wasteful number, since it uses less digits than its factorization.

66849761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19863.

The product of its digits is 435456, while the sum is 47.

The square root of 66849761 is about 8176.1703137838. The cubic root of 66849761 is about 405.8509993008.

The spelling of 66849761 in words is "sixty-six million, eight hundred forty-nine thousand, seven hundred sixty-one".