66247248641 has 8 divisors (see below), whose sum is σ = 75715936320. Its totient is φ = 56779759728.

The previous prime is 66247248637. The next prime is 66247248659. The reversal of 66247248641 is 14684274266.

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 66247248641 - 2² = 66247248637 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 66247248641.

It is not an unprimeable number, because it can be changed into a prime (66247248631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177971 + ... + 405176.

It is an arithmetic number, because the mean of its divisors is an integer number (9464492040).

Almost surely, 2^66247248641 is an apocalyptic number.

It is an amenable number.

66247248641 is a deficient number, since it is larger than the sum of its proper divisors (9468687679).

66247248641 is a wasteful number, since it uses less digits than its factorization.

66247248641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599383.

The product of its digits is 3096576, while the sum is 50.

The spelling of 66247248641 in words is "sixty-six billion, two hundred forty-seven million, two hundred forty-eight thousand, six hundred forty-one".