1645432320159 has 24 divisors (see below), whose sum is σ = 2514789803760. Its totient is φ = 1033835830272.

The previous prime is 1645432320139. The next prime is 1645432320163. The reversal of 1645432320159 is 9510232345461.

1645432320159 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 432 + 3 + 201 + 5 + 9 = 666.

It is not a de Polignac number, because 1645432320159 - 2⁹ = 1645432319647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645432320139) 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, 24895524 + ... + 24961529.

It is an arithmetic number, because the mean of its divisors is an integer number (104782908490).

Almost surely, 2^{1645432320159} is an apocalyptic number.

1645432320159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1645432320159 is a deficient number, since it is larger than the sum of its proper divisors (869357483601).

1645432320159 is a wasteful number, since it uses less digits than its factorization.

1645432320159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49857271 (or 49857268 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 1645432320159 in words is "one trillion, six hundred forty-five billion, four hundred thirty-two million, three hundred twenty thousand, one hundred fifty-nine".