1646231443920 has 1920 divisors, whose sum is σ = 7258119022080. Its totient is φ = 340561428480.

The previous prime is 1646231443919. The next prime is 1646231443957. The reversal of 1646231443920 is 293441326461.

1646231443920 is a `hidden beast` number, since 1 + 6 + 4 + 623 + 14 + 4 + 3 + 9 + 2 + 0 = 666.

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 383 ways as a sum of consecutive naturals, for example, 5817072099 + ... + 5817072381.

It is an arithmetic number, because the mean of its divisors is an integer number (3780270324).

Almost surely, 2^{1646231443920} is an apocalyptic number.

1646231443920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646231443920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3629059511040).

1646231443920 is an abundant number, since it is smaller than the sum of its proper divisors (5611887578160).

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

1646231443920 is a wasteful number, since it uses less digits than its factorization.

1646231443920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 1646231443920 in words is "one trillion, six hundred forty-six billion, two hundred thirty-one million, four hundred forty-three thousand, nine hundred twenty".