165741551 has 8 divisors (see below), whose sum is σ = 175718160. Its totient is φ = 155790208.

The previous prime is 165741539. The next prime is 165741571. The reversal of 165741551 is 155147561.

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 165741551 - 2⁶ = 165741487 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 (165741571) 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, 8165 + ... + 19953.

It is an arithmetic number, because the mean of its divisors is an integer number (21964770).

Almost surely, 2^165741551 is an apocalyptic number.

165741551 is a deficient number, since it is larger than the sum of its proper divisors (9976609).

165741551 is a wasteful number, since it uses less digits than its factorization.

165741551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12633.

The product of its digits is 21000, while the sum is 35.

The square root of 165741551 is about 12874.0650534320. The cubic root of 165741551 is about 549.3010968298.

The spelling of 165741551 in words is "one hundred sixty-five million, seven hundred forty-one thousand, five hundred fifty-one".