8216479813649 has 2 divisors, whose sum is σ = 8216479813650. Its totient is φ = 8216479813648.

The previous prime is 8216479813631. The next prime is 8216479813699. The reversal of 8216479813649 is 9463189746128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6569004882049 + 1647474931600 = 2563007^2 + 1283540^2 .

It is a cyclic number.

It is not a de Polignac number, because 8216479813649 - 2¹² = 8216479809553 is a prime.

It is not a weakly prime, because it can be changed into another prime (8216479813699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108239906824 + 4108239906825.

It is an arithmetic number, because the mean of its divisors is an integer number (4108239906825).

Almost surely, 2^{8216479813649} is an apocalyptic number.

It is an amenable number.

8216479813649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216479813649 is an equidigital number, since it uses as much as digits as its factorization.

8216479813649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 68.

The spelling of 8216479813649 in words is "eight trillion, two hundred sixteen billion, four hundred seventy-nine million, eight hundred thirteen thousand, six hundred forty-nine".