640320450161341 has 4 divisors (see below), whose sum is σ = 646660256598684. Its totient is φ = 633980643724000.

The previous prime is 640320450161321. The next prime is 640320450161351. The reversal of 640320450161341 is 143161054023046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 601559503424100 + 38760946737241 = 24526710^2 + 6225829^2 .

It is a cyclic number.

It is not a de Polignac number, because 640320450161341 - 2¹⁷ = 640320450030269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640320450161294 and 640320450161303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640320450161321) 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, 3169903218520 + ... + 3169903218721.

It is an arithmetic number, because the mean of its divisors is an integer number (161665064149671).

Almost surely, 2^{640320450161341} is an apocalyptic number.

It is an amenable number.

640320450161341 is a deficient number, since it is larger than the sum of its proper divisors (6339806437343).

640320450161341 is a wasteful number, since it uses less digits than its factorization.

640320450161341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339806437342.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 640320450161341 in words is "six hundred forty trillion, three hundred twenty billion, four hundred fifty million, one hundred sixty-one thousand, three hundred forty-one".