1891252945626 has 64 divisors (see below), whose sum is σ = 4209416418816. Its totient is φ = 561599438400.

The previous prime is 1891252945619. The next prime is 1891252945639. The reversal of 1891252945626 is 6265492521981.

It is a self number, because there is not a number n which added to its sum of digits gives 1891252945626.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2503545 + ... + 3170211.

It is an arithmetic number, because the mean of its divisors is an integer number (65772131544).

Almost surely, 2^{1891252945626} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891252945626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2104708209408).

1891252945626 is an abundant number, since it is smaller than the sum of its proper divisors (2318163473190).

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

1891252945626 is a wasteful number, since it uses less digits than its factorization.

1891252945626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667547.

The product of its digits is 18662400, while the sum is 60.

The spelling of 1891252945626 in words is "one trillion, eight hundred ninety-one billion, two hundred fifty-two million, nine hundred forty-five thousand, six hundred twenty-six".