1645426440640 has 56 divisors (see below), whose sum is σ = 3922589718432. Its totient is φ = 657428444160.

The previous prime is 1645426440613. The next prime is 1645426440643. The reversal of 1645426440640 is 460446245461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645426440643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2614671 + ... + 3182350.

It is an arithmetic number, because the mean of its divisors is an integer number (70046244972).

Almost surely, 2^{1645426440640} is an apocalyptic number.

1645426440640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645426440640 is an abundant number, since it is smaller than the sum of its proper divisors (2277163277792).

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

1645426440640 is an equidigital number, since it uses as much as digits as its factorization.

1645426440640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5797925 (or 5797915 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 46.

The spelling of 1645426440640 in words is "one trillion, six hundred forty-five billion, four hundred twenty-six million, four hundred forty thousand, six hundred forty".