1640921850594 has 96 divisors (see below), whose sum is σ = 4030996132800. Its totient is φ = 478246861440.

The previous prime is 1640921850587. The next prime is 1640921850641. The reversal of 1640921850594 is 4950581290461.

1640921850594 is a `hidden beast` number, since 1 + 6 + 40 + 9 + 2 + 1 + 8 + 5 + 0 + 594 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1640921850594.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30512709 + ... + 30566439.

It is an arithmetic number, because the mean of its divisors is an integer number (41989543050).

Almost surely, 2^{1640921850594} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640921850594, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2015498066400).

1640921850594 is an abundant number, since it is smaller than the sum of its proper divisors (2390074282206).

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

1640921850594 is a wasteful number, since it uses less digits than its factorization.

1640921850594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60640 (or 60637 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 1640921850594 in words is "one trillion, six hundred forty billion, nine hundred twenty-one million, eight hundred fifty thousand, five hundred ninety-four".