1645444091424 has 96 divisors (see below), whose sum is σ = 4937696862336. Its totient is φ = 469996922880.

The previous prime is 1645444091413. The next prime is 1645444091471. The reversal of 1645444091424 is 4241904445461.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107444 + ... + 2780684.

It is an arithmetic number, because the mean of its divisors is an integer number (51434342316).

Almost surely, 2^{1645444091424} is an apocalyptic number.

1645444091424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1645444091424 is an abundant number, since it is smaller than the sum of its proper divisors (3292252770912).

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

1645444091424 is a wasteful number, since it uses less digits than its factorization.

1645444091424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676898 (or 676890 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 1645444091424 in words is "one trillion, six hundred forty-five billion, four hundred forty-four million, ninety-one thousand, four hundred twenty-four".