128347566708561 has 8 divisors (see below), whose sum is σ = 171152674442784. Its totient is φ = 85553751723360.

The previous prime is 128347566708503. The next prime is 128347566708589. The reversal of 128347566708561 is 165807665743821.

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

It is not a de Polignac number, because 128347566708561 - 2⁶ = 128347566708497 is a prime.

It is a super-2 number, since 2×128347566708561² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128347566708661) 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, 2823160735 + ... + 2823206196.

It is an arithmetic number, because the mean of its divisors is an integer number (21394084305348).

Almost surely, 2^{128347566708561} is an apocalyptic number.

It is an amenable number.

128347566708561 is a deficient number, since it is larger than the sum of its proper divisors (42805107734223).

128347566708561 is an equidigital number, since it uses as much as digits as its factorization.

128347566708561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646374511.

The product of its (nonzero) digits is 406425600, while the sum is 69.

The spelling of 128347566708561 in words is "one hundred twenty-eight trillion, three hundred forty-seven billion, five hundred sixty-six million, seven hundred eight thousand, five hundred sixty-one".