6478449615658 has 8 divisors (see below), whose sum is σ = 9850793251428. Its totient is φ = 3194851865184.

The previous prime is 6478449615647. The next prime is 6478449615661. The reversal of 6478449615658 is 8565169448746.

It can be written as a sum of positive squares in 2 ways, for example, as 6477773251609 + 676364049 = 2545147^2 + 26007^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (73).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22186471141 + ... + 22186471432.

Almost surely, 2^{6478449615658} is an apocalyptic number.

6478449615658 is a deficient number, since it is larger than the sum of its proper divisors (3372343635770).

6478449615658 is a wasteful number, since it uses less digits than its factorization.

6478449615658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44372942648.

The product of its digits is 1393459200, while the sum is 73.

The spelling of 6478449615658 in words is "six trillion, four hundred seventy-eight billion, four hundred forty-nine million, six hundred fifteen thousand, six hundred fifty-eight".