1640043143641 has 4 divisors (see below), whose sum is σ = 1874335021312. Its totient is φ = 1405751265972.

The previous prime is 1640043143617. The next prime is 1640043143663. The reversal of 1640043143641 is 1463413400461.

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 not a de Polignac number, because 1640043143641 - 2¹⁹ = 1640042619353 is a prime.

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 1640043143641.

It is not an unprimeable number, because it can be changed into a prime (1640043143681) 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, 117145938825 + ... + 117145938838.

It is an arithmetic number, because the mean of its divisors is an integer number (468583755328).

Almost surely, 2^{1640043143641} is an apocalyptic number.

It is an amenable number.

1640043143641 is a deficient number, since it is larger than the sum of its proper divisors (234291877671).

1640043143641 is an equidigital number, since it uses as much as digits as its factorization.

1640043143641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234291877670.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 1640043143641 in words is "one trillion, six hundred forty billion, forty-three million, one hundred forty-three thousand, six hundred forty-one".