7516744721 has 2 divisors, whose sum is σ = 7516744722. Its totient is φ = 7516744720.

The previous prime is 7516744709. The next prime is 7516744759. The reversal of 7516744721 is 1274476157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6515718400 + 1001026321 = 80720^2 + 31639^2 .

It is a cyclic number.

It is not a de Polignac number, because 7516744721 - 2²⁶ = 7449635857 is a prime.

It is not a weakly prime, because it can be changed into another prime (7516744321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3758372360 + 3758372361.

It is an arithmetic number, because the mean of its divisors is an integer number (3758372361).

Almost surely, 2^7516744721 is an apocalyptic number.

It is an amenable number.

7516744721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7516744721 is an equidigital number, since it uses as much as digits as its factorization.

7516744721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 44.

The square root of 7516744721 is about 86699.1621701156. The cubic root of 7516744721 is about 1958.8894792814.

The spelling of 7516744721 in words is "seven billion, five hundred sixteen million, seven hundred forty-four thousand, seven hundred twenty-one".