1645223650 has 48 divisors (see below), whose sum is σ = 3617893440. Its totient is φ = 544622400.

The previous prime is 1645223639. The next prime is 1645223663. The reversal of 1645223650 is 563225461.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70896 + ... + 91195.

It is an arithmetic number, because the mean of its divisors is an integer number (75372780).

Almost surely, 2^1645223650 is an apocalyptic number.

1645223650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645223650 is an abundant number, since it is smaller than the sum of its proper divisors (1972669790).

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

1645223650 is a wasteful number, since it uses less digits than its factorization.

1645223650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162139 (or 162134 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1645223650 is about 40561.3566094627. The cubic root of 1645223650 is about 1180.5244365213.

The spelling of 1645223650 in words is "one billion, six hundred forty-five million, two hundred twenty-three thousand, six hundred fifty".