1640326335750 has 128 divisors (see below), whose sum is σ = 4550705003520. Its totient is φ = 437272927200.

The previous prime is 1640326335743. The next prime is 1640326335773. The reversal of 1640326335750 is 575336230461.

It is a happy number.

1640326335750 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 3 + 2 + 633 + 5 + 7 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1640326335696 and 1640326335705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20770839 + ... + 20849661.

It is an arithmetic number, because the mean of its divisors is an integer number (35552382840).

Almost surely, 2^{1640326335750} is an apocalyptic number.

1640326335750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640326335750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2275352501760).

1640326335750 is an abundant number, since it is smaller than the sum of its proper divisors (2910378667770).

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

1640326335750 is a wasteful number, since it uses less digits than its factorization.

1640326335750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81932 (or 81916 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 45.

The spelling of 1640326335750 in words is "one trillion, six hundred forty billion, three hundred twenty-six million, three hundred thirty-five thousand, seven hundred fifty".