66273649 has 16 divisors (see below), whose sum is σ = 74793600. Its totient is φ = 58376208.

The previous prime is 66273637. The next prime is 66273659. The reversal of 66273649 is 94637266.

It is a de Polignac number, because none of the positive numbers 2^k-66273649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66273659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157962 + ... + 158380.

It is an arithmetic number, because the mean of its divisors is an integer number (4674600).

Almost surely, 2^66273649 is an apocalyptic number.

It is an amenable number.

66273649 is a deficient number, since it is larger than the sum of its proper divisors (8519951).

66273649 is an equidigital number, since it uses as much as digits as its factorization.

66273649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 455 counting only the distinct ones).

The product of its digits is 326592, while the sum is 43.

The square root of 66273649 is about 8140.8629149495. The cubic root of 66273649 is about 404.6817578202.

The spelling of 66273649 in words is "sixty-six million, two hundred seventy-three thousand, six hundred forty-nine".