1643012450 has 24 divisors (see below), whose sum is σ = 3086270100. Its totient is φ = 650696000.

The previous prime is 1643012411. The next prime is 1643012461. The reversal of 1643012450 is 542103461.

It can be written as a sum of positive squares in 6 ways, for example, as 788093329 + 854919121 = 28073^2 + 29239^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157625 + ... + 167724.

Almost surely, 2^1643012450 is an apocalyptic number.

1643012450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1643012450 is a deficient number, since it is larger than the sum of its proper divisors (1443257650).

1643012450 is a wasteful number, since it uses less digits than its factorization.

1643012450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325462 (or 325457 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1643012450 is about 40534.0899737493. The cubic root of 1643012450 is about 1179.9953198129.

The spelling of 1643012450 in words is "one billion, six hundred forty-three million, twelve thousand, four hundred fifty".