1645432163 has 4 divisors (see below), whose sum is σ = 1669990920. Its totient is φ = 1620873408.

The previous prime is 1645432147. The next prime is 1645432169. The reversal of 1645432163 is 3612345461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1645432163 - 2⁴ = 1645432147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645432169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12279278 + ... + 12279411.

It is an arithmetic number, because the mean of its divisors is an integer number (417497730).

Almost surely, 2^1645432163 is an apocalyptic number.

1645432163 is a deficient number, since it is larger than the sum of its proper divisors (24558757).

1645432163 is an equidigital number, since it uses as much as digits as its factorization.

1645432163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24558756.

The product of its digits is 51840, while the sum is 35.

The square root of 1645432163 is about 40563.9268685861. The cubic root of 1645432163 is about 1180.5743070041.

The spelling of 1645432163 in words is "one billion, six hundred forty-five million, four hundred thirty-two thousand, one hundred sixty-three".