66654349439 has 8 divisors (see below), whose sum is σ = 69809021952. Its totient is φ = 63521065080.

The previous prime is 66654349379. The next prime is 66654349441. The reversal of 66654349439 is 93494345666.

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 66654349439 - 2²⁰ = 66653300863 is a prime.

It is a super-2 number, since 2×66654349439² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66654349459) 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, 5340659 + ... + 5353124.

It is an arithmetic number, because the mean of its divisors is an integer number (8726127744).

Almost surely, 2^66654349439 is an apocalyptic number.

66654349439 is a deficient number, since it is larger than the sum of its proper divisors (3154672513).

66654349439 is a wasteful number, since it uses less digits than its factorization.

66654349439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10694077.

The product of its digits is 50388480, while the sum is 59.

The spelling of 66654349439 in words is "sixty-six billion, six hundred fifty-four million, three hundred forty-nine thousand, four hundred thirty-nine".