201641550997 has 2 divisors, whose sum is σ = 201641550998. Its totient is φ = 201641550996.

The previous prime is 201641550959. The next prime is 201641551003. The reversal of 201641550997 is 799055146102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189184982116 + 12456568881 = 434954^2 + 111609^2 .

It is a cyclic number.

It is not a de Polignac number, because 201641550997 - 2¹¹ = 201641548949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201641550997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201641550937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100820775498 + 100820775499.

It is an arithmetic number, because the mean of its divisors is an integer number (100820775499).

Almost surely, 2^201641550997 is an apocalyptic number.

It is an amenable number.

201641550997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201641550997 is an equidigital number, since it uses as much as digits as its factorization.

201641550997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 201641550997 in words is "two hundred one billion, six hundred forty-one million, five hundred fifty thousand, nine hundred ninety-seven".