7415516561 has 2 divisors, whose sum is σ = 7415516562. Its totient is φ = 7415516560.

The previous prime is 7415516519. The next prime is 7415516609. The reversal of 7415516561 is 1656155147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5892097600 + 1523418961 = 76760^2 + 39031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7415516561 is a prime.

It is a super-3 number, since 3×7415516561³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7415516761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3707758280 + 3707758281.

It is an arithmetic number, because the mean of its divisors is an integer number (3707758281).

Almost surely, 2^7415516561 is an apocalyptic number.

It is an amenable number.

7415516561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7415516561 is an equidigital number, since it uses as much as digits as its factorization.

7415516561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 41.

The square root of 7415516561 is about 86113.3936214338. The cubic root of 7415516561 is about 1950.0562386586.

The spelling of 7415516561 in words is "seven billion, four hundred fifteen million, five hundred sixteen thousand, five hundred sixty-one".