6645409356 has 24 divisors (see below), whose sum is σ = 15563605680. Its totient is φ = 2206900672.

The previous prime is 6645409339. The next prime is 6645409367. The reversal of 6645409356 is 6539045466.

It is a happy number.

It is a super-2 number, since 2×6645409356² = 88322931017624669472, which contains 22 as substring.

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, 1026111 + ... + 1032566.

It is an arithmetic number, because the mean of its divisors is an integer number (648483570).

Almost surely, 2^6645409356 is an apocalyptic number.

It is an amenable number.

6645409356 is an abundant number, since it is smaller than the sum of its proper divisors (8918196324).

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

6645409356 is a wasteful number, since it uses less digits than its factorization.

6645409356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058953 (or 2058951 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The square root of 6645409356 is about 81519.3802478895. The cubic root of 6645409356 is about 1880.0695383212.

The spelling of 6645409356 in words is "six billion, six hundred forty-five million, four hundred nine thousand, three hundred fifty-six".