201551120565605 has 32 divisors (see below), whose sum is σ = 262338061759200. Its totient is φ = 148052782817280.

The previous prime is 201551120565559. The next prime is 201551120565659. The reversal of 201551120565605 is 506565021155102.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1933584805156 + 199617535760449 = 1390534^2 + 14128607^2 .

It is not a de Polignac number, because 201551120565605 - 2⁶ = 201551120565541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290850071 + ... + 291542219.

It is an arithmetic number, because the mean of its divisors is an integer number (8198064429975).

Almost surely, 2^{201551120565605} is an apocalyptic number.

It is an amenable number.

201551120565605 is a deficient number, since it is larger than the sum of its proper divisors (60786941193595).

201551120565605 is a wasteful number, since it uses less digits than its factorization.

201551120565605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775769.

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 201551120565605 in words is "two hundred one trillion, five hundred fifty-one billion, one hundred twenty million, five hundred sixty-five thousand, six hundred five".