6449433871557 has 8 divisors (see below), whose sum is σ = 8895770857440. Its totient is φ = 4151359733360.

The previous prime is 6449433871511. The next prime is 6449433871571. The reversal of 6449433871557 is 7551783349446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6449433871557 - 2²⁷ = 6449299653829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6449433875557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37065711819 + ... + 37065711992.

It is an arithmetic number, because the mean of its divisors is an integer number (1111971357180).

Almost surely, 2^{6449433871557} is an apocalyptic number.

It is an amenable number.

6449433871557 is a deficient number, since it is larger than the sum of its proper divisors (2446336985883).

6449433871557 is a wasteful number, since it uses less digits than its factorization.

6449433871557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74131423843.

The product of its digits is 304819200, while the sum is 66.

The spelling of 6449433871557 in words is "six trillion, four hundred forty-nine billion, four hundred thirty-three million, eight hundred seventy-one thousand, five hundred fifty-seven".