1645494145 has 8 divisors (see below), whose sum is σ = 2078519040. Its totient is φ = 1247111280.

The previous prime is 1645494143. The next prime is 1645494187. The reversal of 1645494145 is 5414945461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1645494145 - 2¹ = 1645494143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645494143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8660401 + ... + 8660590.

It is an arithmetic number, because the mean of its divisors is an integer number (259814880).

Almost surely, 2^1645494145 is an apocalyptic number.

It is an amenable number.

1645494145 is a deficient number, since it is larger than the sum of its proper divisors (433024895).

1645494145 is a wasteful number, since it uses less digits than its factorization.

1645494145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17321015.

The product of its digits is 345600, while the sum is 43.

The square root of 1645494145 is about 40564.6908653326. The cubic root of 1645494145 is about 1180.5891305541.

The spelling of 1645494145 in words is "one billion, six hundred forty-five million, four hundred ninety-four thousand, one hundred forty-five".