66218003749 has 8 divisors (see below), whose sum is σ = 68052391200. Its totient is φ = 64385969616.

The previous prime is 66218003737. The next prime is 66218003771. The reversal of 66218003749 is 94730081266.

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 66218003749 - 2⁵ = 66218003717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66218003699 and 66218003708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66218003249) 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, 531199 + ... + 643900.

It is an arithmetic number, because the mean of its divisors is an integer number (8506548900).

Almost surely, 2^66218003749 is an apocalyptic number.

It is an amenable number.

66218003749 is a deficient number, since it is larger than the sum of its proper divisors (1834387451).

66218003749 is a wasteful number, since it uses less digits than its factorization.

66218003749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176659.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 66218003749 in words is "sixty-six billion, two hundred eighteen million, three thousand, seven hundred forty-nine".