128667558862361 has 4 divisors (see below), whose sum is σ = 129680689247232. Its totient is φ = 127654428477492.

The previous prime is 128667558862201. The next prime is 128667558862373. The reversal of 128667558862361 is 163268855766821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128667558862361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128667558865361) 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, 506565192245 + ... + 506565192498.

It is an arithmetic number, because the mean of its divisors is an integer number (32420172311808).

Almost surely, 2^{128667558862361} is an apocalyptic number.

It is an amenable number.

128667558862361 is a deficient number, since it is larger than the sum of its proper divisors (1013130384871).

128667558862361 is a wasteful number, since it uses less digits than its factorization.

128667558862361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013130384870.

The product of its digits is 1393459200, while the sum is 74.

The spelling of 128667558862361 in words is "one hundred twenty-eight trillion, six hundred sixty-seven billion, five hundred fifty-eight million, eight hundred sixty-two thousand, three hundred sixty-one".