66245612761 has 8 divisors (see below), whose sum is σ = 66393828000. Its totient is φ = 66097460352.

The previous prime is 66245612747. The next prime is 66245612837. The reversal of 66245612761 is 16721654266.

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 66245612761 - 2⁷ = 66245612633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66245619761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2558466 + ... + 2584228.

It is an arithmetic number, because the mean of its divisors is an integer number (8299228500).

Almost surely, 2^66245612761 is an apocalyptic number.

It is an amenable number.

66245612761 is a deficient number, since it is larger than the sum of its proper divisors (148215239).

66245612761 is a wasteful number, since it uses less digits than its factorization.

66245612761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31415.

The product of its digits is 725760, while the sum is 46.

The spelling of 66245612761 in words is "sixty-six billion, two hundred forty-five million, six hundred twelve thousand, seven hundred sixty-one".