165233551 has 16 divisors (see below), whose sum is σ = 191116800. Its totient is φ = 139932000.

The previous prime is 165233539. The next prime is 165233597. The reversal of 165233551 is 155332561.

It is a cyclic number.

It is not a de Polignac number, because 165233551 - 2¹⁷ = 165102479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165233501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275550 + ... + 276148.

It is an arithmetic number, because the mean of its divisors is an integer number (11944800).

Almost surely, 2^165233551 is an apocalyptic number.

165233551 is a deficient number, since it is larger than the sum of its proper divisors (25883249).

165233551 is a wasteful number, since it uses less digits than its factorization.

165233551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014.

The product of its digits is 13500, while the sum is 31.

The square root of 165233551 is about 12854.3203243112. The cubic root of 165233551 is about 548.7393174931.

The spelling of 165233551 in words is "one hundred sixty-five million, two hundred thirty-three thousand, five hundred fifty-one".