66491849 has 8 divisors (see below), whose sum is σ = 71883840. Its totient is φ = 61289136.

The previous prime is 66491837. The next prime is 66491857. The reversal of 66491849 is 94819466.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-66491849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66491819) 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, 46589 + ... + 47994.

It is an arithmetic number, because the mean of its divisors is an integer number (8985480).

Almost surely, 2^66491849 is an apocalyptic number.

It is an amenable number.

66491849 is a deficient number, since it is larger than the sum of its proper divisors (5391991).

66491849 is a wasteful number, since it uses less digits than its factorization.

66491849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94639.

The product of its digits is 373248, while the sum is 47.

The square root of 66491849 is about 8154.2534299591. The cubic root of 66491849 is about 405.1253973333.

The spelling of 66491849 in words is "sixty-six million, four hundred ninety-one thousand, eight hundred forty-nine".