1644652434450 has 48 divisors (see below), whose sum is σ = 4318663811040. Its totient is φ = 412775512320.

The previous prime is 1644652434443. The next prime is 1644652434479. The reversal of 1644652434450 is 544342564461.

It is a self number, because there is not a number n which added to its sum of digits gives 1644652434450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322478320 + ... + 322483419.

It is an arithmetic number, because the mean of its divisors is an integer number (89972162730).

Almost surely, 2^{1644652434450} is an apocalyptic number.

1644652434450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1644652434450 is an abundant number, since it is smaller than the sum of its proper divisors (2674011376590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644652434450 is a wasteful number, since it uses less digits than its factorization.

1644652434450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644961771 (or 644961766 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 48.

The spelling of 1644652434450 in words is "one trillion, six hundred forty-four billion, six hundred fifty-two million, four hundred thirty-four thousand, four hundred fifty".