1649809940376 has 512 divisors, whose sum is σ = 4986016358400. Its totient is φ = 450644705280.

The previous prime is 1649809940357. The next prime is 1649809940393. The reversal of 1649809940376 is 6730499089461.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 446254560 + ... + 446258256.

It is an arithmetic number, because the mean of its divisors is an integer number (9738313200).

Almost surely, 2^{1649809940376} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649809940376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2493008179200).

1649809940376 is an abundant number, since it is smaller than the sum of its proper divisors (3336206418024).

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

1649809940376 is a wasteful number, since it uses less digits than its factorization.

1649809940376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859 (or 3855 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 66.

The spelling of 1649809940376 in words is "one trillion, six hundred forty-nine billion, eight hundred nine million, nine hundred forty thousand, three hundred seventy-six".