1261825978296 has 128 divisors (see below), whose sum is σ = 3515655628800. Its totient is φ = 374782256640.

The previous prime is 1261825978277. The next prime is 1261825978349. The reversal of 1261825978296 is 6928795281621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3675475 + ... + 4004093.

It is an arithmetic number, because the mean of its divisors is an integer number (27466059600).

Almost surely, 2^{1261825978296} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261825978296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1757827814400).

1261825978296 is an abundant number, since it is smaller than the sum of its proper divisors (2253829650504).

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

1261825978296 is a wasteful number, since it uses less digits than its factorization.

1261825978296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329069 (or 329065 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 66.

The spelling of 1261825978296 in words is "one trillion, two hundred sixty-one billion, eight hundred twenty-five million, nine hundred seventy-eight thousand, two hundred ninety-six".