1643716450 has 24 divisors (see below), whose sum is σ = 3076084368. Its totient is φ = 653449680.

The previous prime is 1643716411. The next prime is 1643716463. The reversal of 1643716450 is 546173461.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92692 + ... + 108991.

It is an arithmetic number, because the mean of its divisors is an integer number (128170182).

Almost surely, 2^1643716450 is an apocalyptic number.

1643716450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1643716450 is a deficient number, since it is larger than the sum of its proper divisors (1432367918).

1643716450 is a wasteful number, since it uses less digits than its factorization.

1643716450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201858 (or 201853 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1643716450 is about 40542.7730921307. The cubic root of 1643716450 is about 1180.1638310303.

The spelling of 1643716450 in words is "one billion, six hundred forty-three million, seven hundred sixteen thousand, four hundred fifty".