1645008645 has 192 divisors, whose sum is σ = 3420831744. Its totient is φ = 670602240.

The previous prime is 1645008643. The next prime is 1645008653. The reversal of 1645008645 is 5468005461.

It is a happy number.

It is not a de Polignac number, because 1645008645 - 2¹ = 1645008643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645008643) 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 191 ways as a sum of consecutive naturals, for example, 22534329 + ... + 22534401.

It is an arithmetic number, because the mean of its divisors is an integer number (17816832).

Almost surely, 2^1645008645 is an apocalyptic number.

1645008645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645008645 is an abundant number, since it is smaller than the sum of its proper divisors (1775823099).

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

1645008645 is a wasteful number, since it uses less digits than its factorization.

1645008645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 1645008645 is about 40558.7061553990. The cubic root of 1645008645 is about 1180.4730089207.

The spelling of 1645008645 in words is "one billion, six hundred forty-five million, eight thousand, six hundred forty-five".