1645650243240 has 256 divisors, whose sum is σ = 5096945917440. Its totient is φ = 424865280000.

The previous prime is 1645650243239. The next prime is 1645650243283. The reversal of 1645650243240 is 423420565461.

It is a happy number.

It is a Cunningham number, because it is equal to 1282829²-1.

It is a junction number, because it is equal to n+sod(n) for n = 1645650243192 and 1645650243201.

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 63 ways as a sum of consecutive naturals, for example, 364321462 + ... + 364325978.

It is an arithmetic number, because the mean of its divisors is an integer number (19909944990).

Almost surely, 2^{1645650243240} is an apocalyptic number.

1645650243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645650243240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548472958720).

1645650243240 is an abundant number, since it is smaller than the sum of its proper divisors (3451295674200).

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

1645650243240 is a wasteful number, since it uses less digits than its factorization.

1645650243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364 (or 5360 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 1645650243240 in words is "one trillion, six hundred forty-five billion, six hundred fifty million, two hundred forty-three thousand, two hundred forty".