1645218996 has 24 divisors (see below), whose sum is σ = 4064659200. Its totient is φ = 516147072.

The previous prime is 1645218961. The next prime is 1645219019. The reversal of 1645218996 is 6998125461.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4032196 + ... + 4032603.

It is an arithmetic number, because the mean of its divisors is an integer number (169360800).

Almost surely, 2^1645218996 is an apocalyptic number.

It is an amenable number.

1645218996 is an abundant number, since it is smaller than the sum of its proper divisors (2419440204).

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

1645218996 is a wasteful number, since it uses less digits than its factorization.

1645218996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064823 (or 8064821 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 1645218996 is about 40561.2992395461. The cubic root of 1645218996 is about 1180.5233233664.

The spelling of 1645218996 in words is "one billion, six hundred forty-five million, two hundred eighteen thousand, nine hundred ninety-six".