1640161043 has 4 divisors (see below), whose sum is σ = 1646082480. Its totient is φ = 1634239608.

The previous prime is 1640161031. The next prime is 1640161063. The reversal of 1640161043 is 3401610461.

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 1640161043 - 2¹⁰ = 1640160019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640161063) 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, 2960303 + ... + 2960856.

It is an arithmetic number, because the mean of its divisors is an integer number (411520620).

Almost surely, 2^1640161043 is an apocalyptic number.

1640161043 is a deficient number, since it is larger than the sum of its proper divisors (5921437).

1640161043 is an equidigital number, since it uses as much as digits as its factorization.

1640161043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921436.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1640161043 is about 40498.9017505413. The cubic root of 1640161043 is about 1179.3123070916.

The spelling of 1640161043 in words is "one billion, six hundred forty million, one hundred sixty-one thousand, forty-three".