8513602661 has 2 divisors, whose sum is σ = 8513602662. Its totient is φ = 8513602660.

The previous prime is 8513602649. The next prime is 8513602679. The reversal of 8513602661 is 1662063158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8478910561 + 34692100 = 92081^2 + 5890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8513602661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8513602961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4256801330 + 4256801331.

It is an arithmetic number, because the mean of its divisors is an integer number (4256801331).

Almost surely, 2^8513602661 is an apocalyptic number.

It is an amenable number.

8513602661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8513602661 is an equidigital number, since it uses as much as digits as its factorization.

8513602661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 8513602661 is about 92269.1858693898. The cubic root of 8513602661 is about 2041.9156250721.

The spelling of 8513602661 in words is "eight billion, five hundred thirteen million, six hundred two thousand, six hundred sixty-one".