1645525560 has 64 divisors (see below), whose sum is σ = 5641804800. Its totient is φ = 376119936.

The previous prime is 1645525537. The next prime is 1645525619. The reversal of 1645525560 is 655255461.

It is a happy number.

It is a super-2 number, since 2×1645525560² = 5415508737226627200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 978640 + ... + 980319.

It is an arithmetic number, because the mean of its divisors is an integer number (88153200).

Almost surely, 2^1645525560 is an apocalyptic number.

1645525560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645525560 is an abundant number, since it is smaller than the sum of its proper divisors (3996279240).

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

1645525560 is a wasteful number, since it uses less digits than its factorization.

1645525560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958980 (or 1958976 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The square root of 1645525560 is about 40565.0780844805. The cubic root of 1645525560 is about 1180.5966435904.

The spelling of 1645525560 in words is "one billion, six hundred forty-five million, five hundred twenty-five thousand, five hundred sixty".