8465608470721 has 2 divisors, whose sum is σ = 8465608470722. Its totient is φ = 8465608470720.

The previous prime is 8465608470719. The next prime is 8465608470763. The reversal of 8465608470721 is 1270748065648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5821290180225 + 2644318290496 = 2412735^2 + 1626136^2 .

It is a cyclic number.

It is not a de Polignac number, because 8465608470721 - 2¹ = 8465608470719 is a prime.

Together with 8465608470719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8465608470421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4232804235360 + 4232804235361.

It is an arithmetic number, because the mean of its divisors is an integer number (4232804235361).

Almost surely, 2^{8465608470721} is an apocalyptic number.

It is an amenable number.

8465608470721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8465608470721 is an equidigital number, since it uses as much as digits as its factorization.

8465608470721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 58.

The spelling of 8465608470721 in words is "eight trillion, four hundred sixty-five billion, six hundred eight million, four hundred seventy thousand, seven hundred twenty-one".