2135202661 has 2 divisors, whose sum is σ = 2135202662. Its totient is φ = 2135202660.

The previous prime is 2135202659. The next prime is 2135202673. The reversal of 2135202661 is 1662025312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1918965636 + 216237025 = 43806^2 + 14705^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135202661 - 2¹ = 2135202659 is a prime.

Together with 2135202659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2135202611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067601330 + 1067601331.

It is an arithmetic number, because the mean of its divisors is an integer number (1067601331).

Almost surely, 2^2135202661 is an apocalyptic number.

It is an amenable number.

2135202661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135202661 is an equidigital number, since it uses as much as digits as its factorization.

2135202661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2135202661 is about 46208.2531697531. The cubic root of 2135202661 is about 1287.6950730408.

Adding to 2135202661 its reverse (1662025312), we get a palindrome (3797227973).

The spelling of 2135202661 in words is "two billion, one hundred thirty-five million, two hundred two thousand, six hundred sixty-one".