165235953 has 4 divisors (see below), whose sum is σ = 220314608. Its totient is φ = 110157300.

The previous prime is 165235949. The next prime is 165235963. The reversal of 165235953 is 359532561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165235953 - 2² = 165235949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165235943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27539323 + ... + 27539328.

It is an arithmetic number, because the mean of its divisors is an integer number (55078652).

Almost surely, 2^165235953 is an apocalyptic number.

It is an amenable number.

165235953 is a deficient number, since it is larger than the sum of its proper divisors (55078655).

165235953 is an equidigital number, since it uses as much as digits as its factorization.

165235953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55078654.

The product of its digits is 121500, while the sum is 39.

The square root of 165235953 is about 12854.4137555938. The cubic root of 165235953 is about 548.7419764879.

The spelling of 165235953 in words is "one hundred sixty-five million, two hundred thirty-five thousand, nine hundred fifty-three".