165206551 has 8 divisors (see below), whose sum is σ = 168966144. Its totient is φ = 161457240.

The previous prime is 165206537. The next prime is 165206557. The reversal of 165206551 is 155602561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165206551 - 2¹³ = 165198359 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 (165206557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36546 + ... + 40816.

It is an arithmetic number, because the mean of its divisors is an integer number (21120768).

Almost surely, 2^165206551 is an apocalyptic number.

165206551 is a deficient number, since it is larger than the sum of its proper divisors (3759593).

165206551 is an equidigital number, since it uses as much as digits as its factorization.

165206551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 165206551 is about 12853.2700508470. The cubic root of 165206551 is about 548.7094269361.

The spelling of 165206551 in words is "one hundred sixty-five million, two hundred six thousand, five hundred fifty-one".