66456333251 has 12 divisors (see below), whose sum is σ = 84334197240. Its totient is φ = 51784155360.

The previous prime is 66456333233. The next prime is 66456333253. The reversal of 66456333251 is 15233365466.

It is a de Polignac number, because none of the positive numbers 2^k-66456333251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66456333253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61647266 + ... + 61648343.

It is an arithmetic number, because the mean of its divisors is an integer number (7027849770).

Almost surely, 2^66456333251 is an apocalyptic number.

66456333251 is a deficient number, since it is larger than the sum of its proper divisors (17877863989).

66456333251 is a wasteful number, since it uses less digits than its factorization.

66456333251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123295634 (or 123295627 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 44.

The spelling of 66456333251 in words is "sixty-six billion, four hundred fifty-six million, three hundred thirty-three thousand, two hundred fifty-one".