1645432320160 has 144 divisors (see below), whose sum is σ = 4136392363320. Its totient is φ = 618415718400.

The previous prime is 1645432320139. The next prime is 1645432320163. The reversal of 1645432320160 is 610232345461.

It can be written as a sum of positive squares in 12 ways, for example, as 912949674256 + 732482645904 = 955484^2 + 855852^2 .

It is not an unprimeable number, because it can be changed into a prime (1645432320163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27760636 + ... + 27819844.

Almost surely, 2^{1645432320160} is an apocalyptic number.

1645432320160 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 1645432320160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068196181660).

1645432320160 is an abundant number, since it is smaller than the sum of its proper divisors (2490960043160).

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

1645432320160 is a wasteful number, since it uses less digits than its factorization.

1645432320160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59859 (or 59834 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 1645432320160 in words is "one trillion, six hundred forty-five billion, four hundred thirty-two million, three hundred twenty thousand, one hundred sixty".