200155705517 has 6 divisors (see below), whose sum is σ = 209236494222. Its totient is φ = 191453283032.

The previous prime is 200155705501. The next prime is 200155705543. The reversal of 200155705517 is 715507551002.

It can be written as a sum of positive squares in only one way, i.e., 192843061321 + 7312644196 = 439139^2 + 85514^2 .

It is not a de Polignac number, because 200155705517 - 2⁴ = 200155705501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200155705577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189182558 + ... + 189183615.

It is an arithmetic number, because the mean of its divisors is an integer number (34872749037).

Almost surely, 2^200155705517 is an apocalyptic number.

It is an amenable number.

200155705517 is a deficient number, since it is larger than the sum of its proper divisors (9080788705).

200155705517 is an equidigital number, since it uses as much as digits as its factorization.

200155705517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378366219 (or 378366196 counting only the distinct ones).

The product of its (nonzero) digits is 61250, while the sum is 38.

The spelling of 200155705517 in words is "two hundred billion, one hundred fifty-five million, seven hundred five thousand, five hundred seventeen".