128181881566 has 8 divisors (see below), whose sum is σ = 192439874304. Its totient is φ = 64035256800.

The previous prime is 128181881557. The next prime is 128181881567. The reversal of 128181881566 is 665188181821.

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

It is a super-2 number, since 2×128181881566² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128181881567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27839115 + ... + 27843718.

It is an arithmetic number, because the mean of its divisors is an integer number (24054984288).

Almost surely, 2^128181881566 is an apocalyptic number.

128181881566 is a deficient number, since it is larger than the sum of its proper divisors (64257992738).

128181881566 is a wasteful number, since it uses less digits than its factorization.

128181881566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55683986.

The product of its digits is 1474560, while the sum is 55.

The spelling of 128181881566 in words is "one hundred twenty-eight billion, one hundred eighty-one million, eight hundred eighty-one thousand, five hundred sixty-six".