128749876091161 has 16 divisors (see below), whose sum is σ = 140213035428480. Its totient is φ = 117509504112000.

The previous prime is 128749876091159. The next prime is 128749876091197. The reversal of 128749876091161 is 161190678947821.

It is not a de Polignac number, because 128749876091161 - 2¹ = 128749876091159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128749876091141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126474946 + ... + 127488868.

It is an arithmetic number, because the mean of its divisors is an integer number (8763314714280).

Almost surely, 2^{128749876091161} is an apocalyptic number.

It is an amenable number.

128749876091161 is a deficient number, since it is larger than the sum of its proper divisors (11463159337319).

128749876091161 is a wasteful number, since it uses less digits than its factorization.

128749876091161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123776.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 128749876091161 in words is "one hundred twenty-eight trillion, seven hundred forty-nine billion, eight hundred seventy-six million, ninety-one thousand, one hundred sixty-one".