1644451436450 has 24 divisors (see below), whose sum is σ = 3064760592768. Its totient is φ = 656472849680.

The previous prime is 1644451436449. The next prime is 1644451436483. The reversal of 1644451436450 is 546341544461.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1644451436395 and 1644451436404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32667722 + ... + 32718021.

It is an arithmetic number, because the mean of its divisors is an integer number (127698358032).

Almost surely, 2^{1644451436450} is an apocalyptic number.

1644451436450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1644451436450 is a deficient number, since it is larger than the sum of its proper divisors (1420309156318).

1644451436450 is a wasteful number, since it uses less digits than its factorization.

1644451436450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65386258 (or 65386253 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 1644451436450 in words is "one trillion, six hundred forty-four billion, four hundred fifty-one million, four hundred thirty-six thousand, four hundred fifty".