66758763449 has 8 divisors (see below), whose sum is σ = 76298652288. Its totient is φ = 57219605280.

The previous prime is 66758763431. The next prime is 66758763523. The reversal of 66758763449 is 94436785766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66758763449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66758769449) 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, 29564 + ... + 366594.

It is an arithmetic number, because the mean of its divisors is an integer number (9537331536).

Almost surely, 2^66758763449 is an apocalyptic number.

It is an amenable number.

66758763449 is a deficient number, since it is larger than the sum of its proper divisors (9539888839).

66758763449 is a wasteful number, since it uses less digits than its factorization.

66758763449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365335.

The product of its digits is 182891520, while the sum is 65.

The spelling of 66758763449 in words is "sixty-six billion, seven hundred fifty-eight million, seven hundred sixty-three thousand, four hundred forty-nine".