128250650641 has 27 divisors (see below), whose sum is σ = 135962532979. Its totient is φ = 120970408832.

The previous prime is 128250650597. The next prime is 128250650753. The reversal of 128250650641 is 146056052821.

The square root of 128250650641 is 358121.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 72403508241 + 55847142400 = 269079^2 + 236320^2 .

It is not a de Polignac number, because 128250650641 - 2¹¹ = 128250648593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128250650594 and 128250650603.

It is not an unprimeable number, because it can be changed into a prime (128250650041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 550431861 + ... + 550432093.

Almost surely, 2^128250650641 is an apocalyptic number.

128250650641 is the 358121-st square number.

128250650641 is the 179061-st centered octagonal number.

It is an amenable number.

128250650641 is a deficient number, since it is larger than the sum of its proper divisors (7711882338).

128250650641 is an frugal number, since it uses more digits than its factorization.

128250650641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 128250650641 in words is "one hundred twenty-eight billion, two hundred fifty million, six hundred fifty thousand, six hundred forty-one".