201666635445 has 16 divisors (see below), whose sum is σ = 351999945792. Its totient is φ = 97777762560.

The previous prime is 201666635441. The next prime is 201666635449. The reversal of 201666635445 is 544536666102.

It is an interprime number because it is at equal distance from previous prime (201666635441) and next prime (201666635449).

It is not a de Polignac number, because 201666635445 - 2² = 201666635441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201666635394 and 201666635403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201666635441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 611110852 + ... + 611111181.

It is an arithmetic number, because the mean of its divisors is an integer number (21999996612).

Almost surely, 2^201666635445 is an apocalyptic number.

It is an amenable number.

201666635445 is a deficient number, since it is larger than the sum of its proper divisors (150333310347).

201666635445 is a wasteful number, since it uses less digits than its factorization.

201666635445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222222052.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 201666635445 in words is "two hundred one billion, six hundred sixty-six million, six hundred thirty-five thousand, four hundred forty-five".