6446645557155 has 56 divisors (see below), whose sum is σ = 11603694508560. Its totient is φ = 3436717429440.

The previous prime is 6446645557087. The next prime is 6446645557181. The reversal of 6446645557155 is 5517555466446.

It is a happy number.

6446645557155 is a `hidden beast` number, since 6 + 4 + 4 + 6 + 6 + 4 + 5 + 5 + 571 + 55 = 666.

It is not a de Polignac number, because 6446645557155 - 2¹¹ = 6446645555107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6446645557092 and 6446645557101.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 8033320 + ... + 8799290.

It is an arithmetic number, because the mean of its divisors is an integer number (207208830510).

Almost surely, 2^{6446645557155} is an apocalyptic number.

6446645557155 is a deficient number, since it is larger than the sum of its proper divisors (5157048951405).

6446645557155 is an equidigital number, since it uses as much as digits as its factorization.

6446645557155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768303 (or 768288 counting only the distinct ones).

The product of its digits is 302400000, while the sum is 63.

The spelling of 6446645557155 in words is "six trillion, four hundred forty-six billion, six hundred forty-five million, five hundred fifty-seven thousand, one hundred fifty-five".