6645512540 has 24 divisors (see below), whose sum is σ = 14005969152. Its totient is φ = 2648606400.

The previous prime is 6645512519. The next prime is 6645512579. The reversal of 6645512540 is 452155466.

It is a junction number, because it is equal to n+sod(n) for n = 6645512494 and 6645512503.

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, 594236 + ... + 605315.

It is an arithmetic number, because the mean of its divisors is an integer number (583582048).

Almost surely, 2^6645512540 is an apocalyptic number.

It is an amenable number.

6645512540 is an abundant number, since it is smaller than the sum of its proper divisors (7360456612).

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

6645512540 is a wasteful number, since it uses less digits than its factorization.

6645512540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199837 (or 1199835 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The square root of 6645512540 is about 81520.0131256123. The cubic root of 6645512540 is about 1880.0792689528.

The spelling of 6645512540 in words is "six billion, six hundred forty-five million, five hundred twelve thousand, five hundred forty".