213238767661 has 2 divisors, whose sum is σ = 213238767662. Its totient is φ = 213238767660.

The previous prime is 213238767629. The next prime is 213238767697. The reversal of 213238767661 is 166767832312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159324714025 + 53914053636 = 399155^2 + 232194^2 .

It is a cyclic number.

It is not a de Polignac number, because 213238767661 - 2⁵ = 213238767629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213238767599 and 213238767608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213238767611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106619383830 + 106619383831.

It is an arithmetic number, because the mean of its divisors is an integer number (106619383831).

Almost surely, 2^213238767661 is an apocalyptic number.

It is an amenable number.

213238767661 is a deficient number, since it is larger than the sum of its proper divisors (1).

213238767661 is an equidigital number, since it uses as much as digits as its factorization.

213238767661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 52.

The spelling of 213238767661 in words is "two hundred thirteen billion, two hundred thirty-eight million, seven hundred sixty-seven thousand, six hundred sixty-one".