1640615043 has 4 divisors (see below), whose sum is σ = 2187486728. Its totient is φ = 1093743360.

The previous prime is 1640615023. The next prime is 1640615051. The reversal of 1640615043 is 3405160461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3405160461 = 3 ⋅1135053487.

It is not a de Polignac number, because 1640615043 - 2⁶ = 1640614979 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 1640615043.

It is not an unprimeable number, because it can be changed into a prime (1640615023) 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, 273435838 + ... + 273435843.

It is an arithmetic number, because the mean of its divisors is an integer number (546871682).

Almost surely, 2^1640615043 is an apocalyptic number.

1640615043 is a deficient number, since it is larger than the sum of its proper divisors (546871685).

1640615043 is an equidigital number, since it uses as much as digits as its factorization.

1640615043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546871684.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1640615043 is about 40504.5064529862. The cubic root of 1640615043 is about 1179.4211090893.

The spelling of 1640615043 in words is "one billion, six hundred forty million, six hundred fifteen thousand, forty-three".