1645198518 has 16 divisors (see below), whose sum is σ = 3335471856. Its totient is φ = 540887040.

The previous prime is 1645198501. The next prime is 1645198523. The reversal of 1645198518 is 8158915461.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1877643 + ... + 1878518.

It is an arithmetic number, because the mean of its divisors is an integer number (208466991).

Almost surely, 2^1645198518 is an apocalyptic number.

1645198518 is an abundant number, since it is smaller than the sum of its proper divisors (1690273338).

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

1645198518 is a wasteful number, since it uses less digits than its factorization.

1645198518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756239.

The product of its digits is 345600, while the sum is 48.

The square root of 1645198518 is about 40561.0468060182. The cubic root of 1645198518 is about 1180.5184253646.

The spelling of 1645198518 in words is "one billion, six hundred forty-five million, one hundred ninety-eight thousand, five hundred eighteen".