212661623661049 has 2 divisors, whose sum is σ = 212661623661050. Its totient is φ = 212661623661048.

The previous prime is 212661623661013. The next prime is 212661623661131. The reversal of 212661623661049 is 940166326166212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189368065865449 + 23293557795600 = 13761107^2 + 4826340^2 .

It is a cyclic number.

It is not a de Polignac number, because 212661623661049 - 2⁹ = 212661623660537 is a prime.

It is not a weakly prime, because it can be changed into another prime (212661623661449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106330811830524 + 106330811830525.

It is an arithmetic number, because the mean of its divisors is an integer number (106330811830525).

Almost surely, 2^{212661623661049} is an apocalyptic number.

It is an amenable number.

212661623661049 is a deficient number, since it is larger than the sum of its proper divisors (1).

212661623661049 is an equidigital number, since it uses as much as digits as its factorization.

212661623661049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The spelling of 212661623661049 in words is "two hundred twelve trillion, six hundred sixty-one billion, six hundred twenty-three million, six hundred sixty-one thousand, forty-nine".