201885716661 has 4 divisors (see below), whose sum is σ = 269180955552. Its totient is φ = 134590477772.

The previous prime is 201885716639. The next prime is 201885716839. The reversal of 201885716661 is 166617588102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201885716661 - 2¹⁵ = 201885683893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201885716861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33647619441 + ... + 33647619446.

It is an arithmetic number, because the mean of its divisors is an integer number (67295238888).

Almost surely, 2^201885716661 is an apocalyptic number.

It is an amenable number.

201885716661 is a deficient number, since it is larger than the sum of its proper divisors (67295238891).

201885716661 is an equidigital number, since it uses as much as digits as its factorization.

201885716661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67295238890.

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 201885716661 in words is "two hundred one billion, eight hundred eighty-five million, seven hundred sixteen thousand, six hundred sixty-one".