66326442251 has 8 divisors (see below), whose sum is σ = 66657748080. Its totient is φ = 65995499232.

The previous prime is 66326442229. The next prime is 66326442263. The reversal of 66326442251 is 15224462366.

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

It is a cyclic number.

It is not a de Polignac number, because 66326442251 - 2²² = 66322247947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66326442199 and 66326442208.

It is not an unprimeable number, because it can be changed into a prime (66326442751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279596 + ... + 459158.

It is an arithmetic number, because the mean of its divisors is an integer number (8332218510).

Almost surely, 2^66326442251 is an apocalyptic number.

66326442251 is a deficient number, since it is larger than the sum of its proper divisors (331305829).

66326442251 is a wasteful number, since it uses less digits than its factorization.

66326442251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181405.

The product of its digits is 414720, while the sum is 41.

The spelling of 66326442251 in words is "sixty-six billion, three hundred twenty-six million, four hundred forty-two thousand, two hundred fifty-one".