66849973 has 4 divisors (see below), whose sum is σ = 67129920. Its totient is φ = 66570028.

The previous prime is 66849949. The next prime is 66850073. The reversal of 66849973 is 37994866.

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 a de Polignac number, because none of the positive numbers 2^k-66849973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66849973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66849073) 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, 139615 + ... + 140092.

It is an arithmetic number, because the mean of its divisors is an integer number (16782480).

Almost surely, 2^66849973 is an apocalyptic number.

It is an amenable number.

66849973 is a deficient number, since it is larger than the sum of its proper divisors (279947).

66849973 is a wasteful number, since it uses less digits than its factorization.

66849973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279946.

The product of its digits is 1959552, while the sum is 52.

The square root of 66849973 is about 8176.1832782784. The cubic root of 66849973 is about 405.8514283241.

The spelling of 66849973 in words is "sixty-six million, eight hundred forty-nine thousand, nine hundred seventy-three".