206641237553 has 2 divisors, whose sum is σ = 206641237554. Its totient is φ = 206641237552.

The previous prime is 206641237541. The next prime is 206641237591. The reversal of 206641237553 is 355732146602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201231193744 + 5410043809 = 448588^2 + 73553^2 .

It is a cyclic number.

It is not a de Polignac number, because 206641237553 - 2⁶ = 206641237489 is a prime.

It is not a weakly prime, because it can be changed into another prime (206641230553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103320618776 + 103320618777.

It is an arithmetic number, because the mean of its divisors is an integer number (103320618777).

Almost surely, 2^206641237553 is an apocalyptic number.

It is an amenable number.

206641237553 is a deficient number, since it is larger than the sum of its proper divisors (1).

206641237553 is an equidigital number, since it uses as much as digits as its factorization.

206641237553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 206641237553 in words is "two hundred six billion, six hundred forty-one million, two hundred thirty-seven thousand, five hundred fifty-three".