1643446440630 has 40 divisors (see below), whose sum is σ = 4419044875872. Its totient is φ = 438252383952.

The previous prime is 1643446440563. The next prime is 1643446440733. The reversal of 1643446440630 is 360446443461.

1643446440630 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 4 + 4 + 6 + 4 + 4 + 0 + 630 = 666.

It is a super-3 number, since 3×1643446440630³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1014472302 + ... + 1014473921.

Almost surely, 2^{1643446440630} is an apocalyptic number.

1643446440630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1643446440630 is an abundant number, since it is smaller than the sum of its proper divisors (2775598435242).

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

1643446440630 is a wasteful number, since it uses less digits than its factorization.

1643446440630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028946242 (or 2028946233 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 45.

The spelling of 1643446440630 in words is "one trillion, six hundred forty-three billion, four hundred forty-six million, four hundred forty thousand, six hundred thirty".