201666465 has 192 divisors, whose sum is σ = 486001152. Its totient is φ = 75271680.

The previous prime is 201666457. The next prime is 201666499. The reversal of 201666465 is 564666102.

It is a happy number.

It is not a de Polignac number, because 201666465 - 2³ = 201666457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5450427 + ... + 5450463.

It is an arithmetic number, because the mean of its divisors is an integer number (2531256).

Almost surely, 2^201666465 is an apocalyptic number.

It is an amenable number.

201666465 is an abundant number, since it is smaller than the sum of its proper divisors (284334687).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201666465 is a wasteful number, since it uses less digits than its factorization.

201666465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 201666465 is about 14200.9318356226. The cubic root of 201666465 is about 586.4233148692.

It can be divided in two parts, 201 and 666465, that added together give a palindrome (666666).

The spelling of 201666465 in words is "two hundred one million, six hundred sixty-six thousand, four hundred sixty-five".