128780417551 has 4 divisors (see below), whose sum is σ = 128792988072. Its totient is φ = 128767847032.

The previous prime is 128780417531. The next prime is 128780417567. The reversal of 128780417551 is 155714087821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128780417551 - 2⁹ = 128780417039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128780417495 and 128780417504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128780417531) 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, 6269881 + ... + 6290386.

It is an arithmetic number, because the mean of its divisors is an integer number (32198247018).

Almost surely, 2^128780417551 is an apocalyptic number.

128780417551 is a deficient number, since it is larger than the sum of its proper divisors (12570521).

128780417551 is a wasteful number, since it uses less digits than its factorization.

128780417551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12570520.

The product of its (nonzero) digits is 627200, while the sum is 49.

The spelling of 128780417551 in words is "one hundred twenty-eight billion, seven hundred eighty million, four hundred seventeen thousand, five hundred fifty-one".