1645366520 has 32 divisors (see below), whose sum is σ = 4230943200. Its totient is φ = 564125568.

The previous prime is 1645366493. The next prime is 1645366529. The reversal of 1645366520 is 256635461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645366529) 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, 2937875 + ... + 2938434.

It is an arithmetic number, because the mean of its divisors is an integer number (132216975).

Almost surely, 2^1645366520 is an apocalyptic number.

1645366520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645366520 is an abundant number, since it is smaller than the sum of its proper divisors (2585576680).

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

1645366520 is a wasteful number, since it uses less digits than its factorization.

1645366520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876327 (or 5876323 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 1645366520 is about 40563.1177302732. The cubic root of 1645366520 is about 1180.5586074873.

The spelling of 1645366520 in words is "one billion, six hundred forty-five million, three hundred sixty-six thousand, five hundred twenty".