7663045721 has 2 divisors, whose sum is σ = 7663045722. Its totient is φ = 7663045720.

The previous prime is 7663045711. The next prime is 7663045751. The reversal of 7663045721 is 1275403667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6716622025 + 946423696 = 81955^2 + 30764^2 .

It is a cyclic number.

It is not a de Polignac number, because 7663045721 - 2⁶ = 7663045657 is a prime.

It is not a weakly prime, because it can be changed into another prime (7663045711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3831522860 + 3831522861.

It is an arithmetic number, because the mean of its divisors is an integer number (3831522861).

Almost surely, 2^7663045721 is an apocalyptic number.

It is an amenable number.

7663045721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7663045721 is an equidigital number, since it uses as much as digits as its factorization.

7663045721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 7663045721 is about 87538.8240782340. The cubic root of 7663045721 is about 1971.5167548154.

The spelling of 7663045721 in words is "seven billion, six hundred sixty-three million, forty-five thousand, seven hundred twenty-one".