128991653541 has 12 divisors (see below), whose sum is σ = 187743578880. Its totient is φ = 85337988840.

The previous prime is 128991653521. The next prime is 128991653617. The reversal of 128991653541 is 145356199821.

128991653541 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 91 + 6 + 5 + 3 + 541 = 666.

It is not a de Polignac number, because 128991653541 - 2²⁶ = 128924544677 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128991653521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54702661 + ... + 54705018.

It is an arithmetic number, because the mean of its divisors is an integer number (15645298240).

Almost surely, 2^128991653541 is an apocalyptic number.

It is an amenable number.

128991653541 is a deficient number, since it is larger than the sum of its proper divisors (58751925339).

128991653541 is a wasteful number, since it uses less digits than its factorization.

128991653541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109407816 (or 109407813 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 128991653541 in words is "one hundred twenty-eight billion, nine hundred ninety-one million, six hundred fifty-three thousand, five hundred forty-one".