1640326335749 has 4 divisors (see below), whose sum is σ = 1640334443136. Its totient is φ = 1640318228364.

The previous prime is 1640326335743. The next prime is 1640326335773. The reversal of 1640326335749 is 9475336230461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640326335749 is a prime.

It is a super-3 number, since 3×1640326335749³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640326335749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640326335743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3742229 + ... + 4157514.

It is an arithmetic number, because the mean of its divisors is an integer number (410083610784).

Almost surely, 2^{1640326335749} is an apocalyptic number.

It is an amenable number.

1640326335749 is a deficient number, since it is larger than the sum of its proper divisors (8107387).

1640326335749 is an equidigital number, since it uses as much as digits as its factorization.

1640326335749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8107386.

The product of its (nonzero) digits is 9797760, while the sum is 53.

The spelling of 1640326335749 in words is "one trillion, six hundred forty billion, three hundred twenty-six million, three hundred thirty-five thousand, seven hundred forty-nine".