6478196561 has 2 divisors, whose sum is σ = 6478196562. Its totient is φ = 6478196560.

The previous prime is 6478196533. The next prime is 6478196603. The reversal of 6478196561 is 1656918746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5814825025 + 663371536 = 76255^2 + 25756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6478196561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6478126561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239098280 + 3239098281.

It is an arithmetic number, because the mean of its divisors is an integer number (3239098281).

Almost surely, 2^6478196561 is an apocalyptic number.

It is an amenable number.

6478196561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6478196561 is an equidigital number, since it uses as much as digits as its factorization.

6478196561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 6478196561 is about 80487.2447099539. The cubic root of 6478196561 is about 1864.1665336891.

The spelling of 6478196561 in words is "six billion, four hundred seventy-eight million, one hundred ninety-six thousand, five hundred sixty-one".