1971143726250 has 160 divisors (see below), whose sum is σ = 5054988685824. Its totient is φ = 511948800000.

The previous prime is 1971143726207. The next prime is 1971143726261. The reversal of 1971143726250 is 526273411791.

It is a self number, because there is not a number n which added to its sum of digits gives 1971143726250.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 93315690 + ... + 93336810.

Almost surely, 2^{1971143726250} is an apocalyptic number.

1971143726250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1971143726250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527494342912).

1971143726250 is an abundant number, since it is smaller than the sum of its proper divisors (3083844959574).

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

1971143726250 is a wasteful number, since it uses less digits than its factorization.

1971143726250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21794 (or 21779 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 1971143726250 in words is "one trillion, nine hundred seventy-one billion, one hundred forty-three million, seven hundred twenty-six thousand, two hundred fifty".