128666317039 has 8 divisors (see below), whose sum is σ = 138580478960. Its totient is φ = 118754548416.

The previous prime is 128666316991. The next prime is 128666317063. The reversal of 128666317039 is 930713666821.

It is a happy number.

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 128666317039 - 2¹³ = 128666308847 is a prime.

It is a super-2 number, since 2×128666317039² (a number of 23 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 (128666317639) 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, 485877 + ... + 702430.

It is an arithmetic number, because the mean of its divisors is an integer number (17322559870).

Almost surely, 2^128666317039 is an apocalyptic number.

128666317039 is a deficient number, since it is larger than the sum of its proper divisors (9914161921).

128666317039 is a wasteful number, since it uses less digits than its factorization.

128666317039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196649.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 128666317039 in words is "one hundred twenty-eight billion, six hundred sixty-six million, three hundred seventeen thousand, thirty-nine".