1640532541643 has 4 divisors (see below), whose sum is σ = 1640540477160. Its totient is φ = 1640524606128.

The previous prime is 1640532541633. The next prime is 1640532541657. The reversal of 1640532541643 is 3461452350461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640532541643 - 2¹⁴ = 1640532525259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640532541594 and 1640532541603.

It is not an unprimeable number, because it can be changed into a prime (1640532541603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3649130 + ... + 4073967.

It is an arithmetic number, because the mean of its divisors is an integer number (410135119290).

Almost surely, 2^{1640532541643} is an apocalyptic number.

1640532541643 is a deficient number, since it is larger than the sum of its proper divisors (7935517).

1640532541643 is an equidigital number, since it uses as much as digits as its factorization.

1640532541643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7935516.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 1640532541643 in words is "one trillion, six hundred forty billion, five hundred thirty-two million, five hundred forty-one thousand, six hundred forty-three".