6478546921 has 8 divisors (see below), whose sum is σ = 8077149504. Its totient is φ = 5048218320.

The previous prime is 6478546891. The next prime is 6478546933. The reversal of 6478546921 is 1296458746.

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 6478546921 - 2¹⁹ = 6478022633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6478546621) 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, 42068410 + ... + 42068563.

It is an arithmetic number, because the mean of its divisors is an integer number (1009643688).

Almost surely, 2^6478546921 is an apocalyptic number.

It is an amenable number.

6478546921 is a deficient number, since it is larger than the sum of its proper divisors (1598602583).

6478546921 is a wasteful number, since it uses less digits than its factorization.

6478546921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84136991.

The product of its digits is 2903040, while the sum is 52.

The square root of 6478546921 is about 80489.4211744624. The cubic root of 6478546921 is about 1864.2001396269.

The spelling of 6478546921 in words is "six billion, four hundred seventy-eight million, five hundred forty-six thousand, nine hundred twenty-one".