1649315203856 has 80 divisors (see below), whose sum is σ = 3414011846400. Its totient is φ = 770523393024.

The previous prime is 1649315203853. The next prime is 1649315203871. The reversal of 1649315203856 is 6583025139461.

It is a junction number, because it is equal to n+sod(n) for n = 1649315203798 and 1649315203807.

It is not an unprimeable number, because it can be changed into a prime (1649315203853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516031 + ... + 2365793.

It is an arithmetic number, because the mean of its divisors is an integer number (42675148080).

Almost surely, 2^{1649315203856} is an apocalyptic number.

1649315203856 is a gapful number since it is divisible by the number (16) 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 1649315203856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707005923200).

1649315203856 is an abundant number, since it is smaller than the sum of its proper divisors (1764696642544).

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

1649315203856 is a wasteful number, since it uses less digits than its factorization.

1649315203856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849936 (or 849930 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 1649315203856 in words is "one trillion, six hundred forty-nine billion, three hundred fifteen million, two hundred three thousand, eight hundred fifty-six".