1640016443 has 4 divisors (see below), whose sum is σ = 1766171568. Its totient is φ = 1513861320.

The previous prime is 1640016421. The next prime is 1640016457. The reversal of 1640016443 is 3446100461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3446100461 = 31 ⋅111164531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640016443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640016473) 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, 63077543 + ... + 63077568.

It is an arithmetic number, because the mean of its divisors is an integer number (441542892).

Almost surely, 2^1640016443 is an apocalyptic number.

1640016443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1640016443 is a deficient number, since it is larger than the sum of its proper divisors (126155125).

1640016443 is a wasteful number, since it uses less digits than its factorization.

1640016443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126155124.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1640016443 is about 40497.1164775963. The cubic root of 1640016443 is about 1179.2776491999.

The spelling of 1640016443 in words is "one billion, six hundred forty million, sixteen thousand, four hundred forty-three".