6645360633540 has 48 divisors (see below), whose sum is σ = 18611910862272. Its totient is φ = 1771629398656.

The previous prime is 6645360633491. The next prime is 6645360633557. The reversal of 6645360633540 is 453360635466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14356854 + ... + 14812493.

It is an arithmetic number, because the mean of its divisors is an integer number (387748142964).

Almost surely, 2^{6645360633540} is an apocalyptic number.

6645360633540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6645360633540 is an abundant number, since it is smaller than the sum of its proper divisors (11966550228732).

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

6645360633540 is a wasteful number, since it uses less digits than its factorization.

6645360633540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29173156 (or 29173154 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 51.

The spelling of 6645360633540 in words is "six trillion, six hundred forty-five billion, three hundred sixty million, six hundred thirty-three thousand, five hundred forty".