66033865491 has 8 divisors (see below), whose sum is σ = 96049258944. Its totient is φ = 40020524520.

The previous prime is 66033865487. The next prime is 66033865501. The reversal of 66033865491 is 19456833066.

It is a happy number.

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

It is not a de Polignac number, because 66033865491 - 2² = 66033865487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66033865291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000513081 + ... + 1000513146.

It is an arithmetic number, because the mean of its divisors is an integer number (12006157368).

Almost surely, 2^66033865491 is an apocalyptic number.

66033865491 is a deficient number, since it is larger than the sum of its proper divisors (30015393453).

66033865491 is a wasteful number, since it uses less digits than its factorization.

66033865491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001026241.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 66033865491 in words is "sixty-six billion, thirty-three million, eight hundred sixty-five thousand, four hundred ninety-one".