1646140816 has 40 divisors (see below), whose sum is σ = 3279102624. Its totient is φ = 800067840.

The previous prime is 1646140813. The next prime is 1646140817. The reversal of 1646140816 is 6180416461.

It is a super-2 number, since 2×1646140816² = 5419559172202291712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646140813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181215 + ... + 190081.

Almost surely, 2^1646140816 is an apocalyptic number.

1646140816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1646140816 is a deficient number, since it is larger than the sum of its proper divisors (1632961808).

1646140816 is a wasteful number, since it uses less digits than its factorization.

1646140816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9199 (or 9193 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1646140816 is about 40572.6609430538. The cubic root of 1646140816 is about 1180.7437655142.

The spelling of 1646140816 in words is "one billion, six hundred forty-six million, one hundred forty thousand, eight hundred sixteen".