775643920128 has 216 divisors, whose sum is σ = 2788205486976. Its totient is φ = 201465907200.

The previous prime is 775643920097. The next prime is 775643920151. The reversal of 775643920128 is 821029346577.

It is a happy number.

775643920128 is a `hidden beast` number, since 7 + 7 + 564 + 39 + 20 + 1 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2008638 + ... + 2363453.

It is an arithmetic number, because the mean of its divisors is an integer number (12908358736).

It is a 1-persistent number, because it is pandigital, but 2⋅775643920128 = 1551287840256 is not.

Almost surely, 2^775643920128 is an apocalyptic number.

It is an amenable number.

775643920128 is an abundant number, since it is smaller than the sum of its proper divisors (2012561566848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775643920128 is a wasteful number, since it uses less digits than its factorization.

775643920128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372131 (or 4372114 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 775643920128 in words is "seven hundred seventy-five billion, six hundred forty-three million, nine hundred twenty thousand, one hundred twenty-eight".