1920128978125 has 12 divisors (see below), whose sum is σ = 2400007616244. Its totient is φ = 1536103180000.

The previous prime is 1920128978093. The next prime is 1920128978143. The reversal of 1920128978125 is 5218798210291.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1836832668804 + 83296309321 = 1355298^2 + 288611^2 .

It is not a de Polignac number, because 1920128978125 - 2⁵ = 1920128978093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307217512 + ... + 307223761.

It is an arithmetic number, because the mean of its divisors is an integer number (200000634687).

Almost surely, 2^{1920128978125} is an apocalyptic number.

It is an amenable number.

1920128978125 is a deficient number, since it is larger than the sum of its proper divisors (479878638119).

1920128978125 is an frugal number, since it uses more digits than its factorization.

1920128978125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614441298 (or 614441278 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 55.

The spelling of 1920128978125 in words is "one trillion, nine hundred twenty billion, one hundred twenty-eight million, nine hundred seventy-eight thousand, one hundred twenty-five".