1649671043020 has 288 divisors, whose sum is σ = 4897709167680. Its totient is φ = 458262927360.

The previous prime is 1649671042979. The next prime is 1649671043029. The reversal of 1649671043020 is 203401769461.

It is not an unprimeable number, because it can be changed into a prime (1649671043029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3861102 + ... + 4267018.

It is an arithmetic number, because the mean of its divisors is an integer number (17005934610).

Almost surely, 2^{1649671043020} is an apocalyptic number.

1649671043020 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 1649671043020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2448854583840).

1649671043020 is an abundant number, since it is smaller than the sum of its proper divisors (3248038124660).

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

1649671043020 is a wasteful number, since it uses less digits than its factorization.

1649671043020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405993 (or 405984 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 1649671043020 in words is "one trillion, six hundred forty-nine billion, six hundred seventy-one million, forty-three thousand, twenty".