165201651 has 12 divisors (see below), whose sum is σ = 238898400. Its totient is φ = 110008080.

The previous prime is 165201649. The next prime is 165201667. The reversal of 165201651 is 156102561.

It is a happy number.

165201651 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 0 + 1 + 651 = 666.

It is not a de Polignac number, because 165201651 - 2¹ = 165201649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165201671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1876 + ... + 18273.

It is an arithmetic number, because the mean of its divisors is an integer number (19908200).

Almost surely, 2^165201651 is an apocalyptic number.

165201651 is a deficient number, since it is larger than the sum of its proper divisors (73696749).

165201651 is a wasteful number, since it uses less digits than its factorization.

165201651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21066 (or 21063 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 165201651 is about 12853.0794364619. The cubic root of 165201651 is about 548.7040020043.

The spelling of 165201651 in words is "one hundred sixty-five million, two hundred one thousand, six hundred fifty-one".