6478449615657 has 48 divisors (see below), whose sum is σ = 10250957808000. Its totient is φ = 3926904371712.

The previous prime is 6478449615647. The next prime is 6478449615661. The reversal of 6478449615657 is 7565169448746.

6478449615657 is a `hidden beast` number, since 6 + 4 + 7 + 84 + 496 + 1 + 5 + 6 + 57 = 666.

It is not a de Polignac number, because 6478449615657 - 2¹⁴ = 6478449599273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6478449615647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3083232 + ... + 4739537.

It is an arithmetic number, because the mean of its divisors is an integer number (213561621000).

Almost surely, 2^{6478449615657} is an apocalyptic number.

It is an amenable number.

6478449615657 is a deficient number, since it is larger than the sum of its proper divisors (3772508192343).

6478449615657 is a wasteful number, since it uses less digits than its factorization.

6478449615657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822990 (or 7822987 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 72.

The spelling of 6478449615657 in words is "six trillion, four hundred seventy-eight billion, four hundred forty-nine million, six hundred fifteen thousand, six hundred fifty-seven".