128205512644 has 12 divisors (see below), whose sum is σ = 244755978768. Its totient is φ = 58275233000.

The previous prime is 128205512641. The next prime is 128205512647. The reversal of 128205512644 is 446215502821.

It is an interprime number because it is at equal distance from previous prime (128205512641) and next prime (128205512647).

It is a junction number, because it is equal to n+sod(n) for n = 128205512597 and 128205512606.

It is not an unprimeable number, because it can be changed into a prime (128205512641) 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, 1456880782 + ... + 1456880869.

It is an arithmetic number, because the mean of its divisors is an integer number (20396331564).

Almost surely, 2^128205512644 is an apocalyptic number.

It is an amenable number.

128205512644 is a deficient number, since it is larger than the sum of its proper divisors (116550466124).

128205512644 is a wasteful number, since it uses less digits than its factorization.

128205512644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913761666 (or 2913761664 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 128205512644 in words is "one hundred twenty-eight billion, two hundred five million, five hundred twelve thousand, six hundred forty-four".