6446620411645 has 16 divisors (see below), whose sum is σ = 7782484147200. Its totient is φ = 5126271614464.

The previous prime is 6446620411643. The next prime is 6446620411697. The reversal of 6446620411645 is 5461140266446.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6446620411645 - 2¹ = 6446620411643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446620411643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37990509 + ... + 38159821.

It is an arithmetic number, because the mean of its divisors is an integer number (486405259200).

Almost surely, 2^{6446620411645} is an apocalyptic number.

It is an amenable number.

6446620411645 is a deficient number, since it is larger than the sum of its proper divisors (1335863735555).

6446620411645 is a wasteful number, since it uses less digits than its factorization.

6446620411645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215084.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 6446620411645 in words is "six trillion, four hundred forty-six billion, six hundred twenty million, four hundred eleven thousand, six hundred forty-five".