6546640401 has 48 divisors (see below), whose sum is σ = 11419035264. Its totient is φ = 3670303104.

The previous prime is 6546640391. The next prime is 6546640411. The reversal of 6546640401 is 1040466456.

6546640401 is a `hidden beast` number, since 6 + 5 + 4 + 6 + 640 + 4 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6546640391) and next prime (6546640411).

It is not a de Polignac number, because 6546640401 - 2¹¹ = 6546638353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6546640411) 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, 53845 + ... + 126461.

It is an arithmetic number, because the mean of its divisors is an integer number (237896568).

Almost surely, 2^6546640401 is an apocalyptic number.

It is an amenable number.

6546640401 is a deficient number, since it is larger than the sum of its proper divisors (4872394863).

6546640401 is an equidigital number, since it uses as much as digits as its factorization.

6546640401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72692 (or 72680 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 6546640401 is about 80911.3119470943. The cubic root of 6546640401 is about 1870.7086832264.

The spelling of 6546640401 in words is "six billion, five hundred forty-six million, six hundred forty thousand, four hundred one".