8046721457 has 2 divisors, whose sum is σ = 8046721458. Its totient is φ = 8046721456.

The previous prime is 8046721439. The next prime is 8046721499. The reversal of 8046721457 is 7541276408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5547121441 + 2499600016 = 74479^2 + 49996^2 .

It is a cyclic number.

It is not a de Polignac number, because 8046721457 - 2⁶ = 8046721393 is a prime.

It is not a weakly prime, because it can be changed into another prime (8046721357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4023360728 + 4023360729.

It is an arithmetic number, because the mean of its divisors is an integer number (4023360729).

Almost surely, 2^8046721457 is an apocalyptic number.

It is an amenable number.

8046721457 is a deficient number, since it is larger than the sum of its proper divisors (1).

8046721457 is an equidigital number, since it uses as much as digits as its factorization.

8046721457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 8046721457 is about 89703.5197581455. The cubic root of 8046721457 is about 2003.8858997517.

The spelling of 8046721457 in words is "eight billion, forty-six million, seven hundred twenty-one thousand, four hundred fifty-seven".