7208140661 has 2 divisors, whose sum is σ = 7208140662. Its totient is φ = 7208140660.

The previous prime is 7208140657. The next prime is 7208140703. The reversal of 7208140661 is 1660418027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6102578161 + 1105562500 = 78119^2 + 33250^2 .

It is a cyclic number.

It is not a de Polignac number, because 7208140661 - 2² = 7208140657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7208140601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3604070330 + 3604070331.

It is an arithmetic number, because the mean of its divisors is an integer number (3604070331).

Almost surely, 2^7208140661 is an apocalyptic number.

It is an amenable number.

7208140661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7208140661 is an equidigital number, since it uses as much as digits as its factorization.

7208140661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 7208140661 is about 84900.7694959239. The cubic root of 7208140661 is about 1931.7062471230.

Adding to 7208140661 its reverse (1660418027), we get a palindrome (8868558688).

The spelling of 7208140661 in words is "seven billion, two hundred eight million, one hundred forty thousand, six hundred sixty-one".