128305001761 has 4 divisors (see below), whose sum is σ = 128778452224. Its totient is φ = 127831551300.

The previous prime is 128305001729. The next prime is 128305001779. The reversal of 128305001761 is 167100503821.

It is a happy number.

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 not a de Polignac number, because 128305001761 - 2⁵ = 128305001729 is a prime.

It is a super-2 number, since 2×128305001761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128305001161) 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, 236724825 + ... + 236725366.

It is an arithmetic number, because the mean of its divisors is an integer number (32194613056).

Almost surely, 2^128305001761 is an apocalyptic number.

It is an amenable number.

128305001761 is a deficient number, since it is larger than the sum of its proper divisors (473450463).

128305001761 is an equidigital number, since it uses as much as digits as its factorization.

128305001761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473450462.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 128305001761 in words is "one hundred twenty-eight billion, three hundred five million, one thousand, seven hundred sixty-one".