165361551 has 8 divisors (see below), whose sum is σ = 220607280. Its totient is φ = 110178432.

The previous prime is 165361549. The next prime is 165361577. The reversal of 165361551 is 155163561.

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

It is not a de Polignac number, because 165361551 - 2¹ = 165361549 is a prime.

It is a super-4 number, since 4×165361551⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165361501) 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, 9096 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (27575910).

Almost surely, 2^165361551 is an apocalyptic number.

165361551 is a deficient number, since it is larger than the sum of its proper divisors (55245729).

165361551 is a wasteful number, since it uses less digits than its factorization.

165361551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31305.

The product of its digits is 13500, while the sum is 33.

The square root of 165361551 is about 12859.2982312411. The cubic root of 165361551 is about 548.8809765831.

The spelling of 165361551 in words is "one hundred sixty-five million, three hundred sixty-one thousand, five hundred fifty-one".