66337254721 has 4 divisors (see below), whose sum is σ = 69828689200. Its totient is φ = 62845820244.

The previous prime is 66337254677. The next prime is 66337254799. The reversal of 66337254721 is 12745273366.

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 66337254721 - 2⁹ = 66337254209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66337254521) 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, 1745717211 + ... + 1745717248.

It is an arithmetic number, because the mean of its divisors is an integer number (17457172300).

Almost surely, 2^66337254721 is an apocalyptic number.

It is an amenable number.

66337254721 is a deficient number, since it is larger than the sum of its proper divisors (3491434479).

66337254721 is a wasteful number, since it uses less digits than its factorization.

66337254721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491434478.

The product of its digits is 1270080, while the sum is 46.

The spelling of 66337254721 in words is "sixty-six billion, three hundred thirty-seven million, two hundred fifty-four thousand, seven hundred twenty-one".