6641220209450 has 48 divisors (see below), whose sum is σ = 12557683295520. Its totient is φ = 2612416536000.

The previous prime is 6641220209443. The next prime is 6641220209471. The reversal of 6641220209450 is 549020221466.

It is a junction number, because it is equal to n+sod(n) for n = 6641220209398 and 6641220209407.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15214745 + ... + 15645155.

It is an arithmetic number, because the mean of its divisors is an integer number (261618401990).

Almost surely, 2^{6641220209450} is an apocalyptic number.

6641220209450 is a deficient number, since it is larger than the sum of its proper divisors (5916463086070).

6641220209450 is a wasteful number, since it uses less digits than its factorization.

6641220209450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435543 (or 435538 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 6641220209450 in words is "six trillion, six hundred forty-one billion, two hundred twenty million, two hundred nine thousand, four hundred fifty".