128612592931681 has 8 divisors (see below), whose sum is σ = 128637889037928. Its totient is φ = 128587299312000.

The previous prime is 128612592931661. The next prime is 128612592931717. The reversal of 128612592931681 is 186139295216821.

It can be written as a sum of positive squares in 4 ways, for example, as 74387175040000 + 54225417891681 = 8624800^2 + 7363791^2 .

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 128612592931681 - 2⁴³ = 119816499909473 is a prime.

It is a super-2 number, since 2×128612592931681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128612592931601) 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, 104577661 + ... + 105800341.

It is an arithmetic number, because the mean of its divisors is an integer number (16079736129741).

Almost surely, 2^{128612592931681} is an apocalyptic number.

It is an amenable number.

128612592931681 is a deficient number, since it is larger than the sum of its proper divisors (25296106247).

128612592931681 is a wasteful number, since it uses less digits than its factorization.

128612592931681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243283.

The product of its digits is 22394880, while the sum is 64.

The spelling of 128612592931681 in words is "one hundred twenty-eight trillion, six hundred twelve billion, five hundred ninety-two million, nine hundred thirty-one thousand, six hundred eighty-one".