165752421 has 8 divisors (see below), whose sum is σ = 230612160. Its totient is φ = 105697152.

The previous prime is 165752393. The next prime is 165752423. The reversal of 165752421 is 124257561.

165752421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 165752421 - 2²⁶ = 98643557 is a prime.

It is a super-2 number, since 2×165752421² = 54947730134722482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165752423) 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, 1201036 + ... + 1201173.

It is an arithmetic number, because the mean of its divisors is an integer number (28826520).

Almost surely, 2^165752421 is an apocalyptic number.

It is an amenable number.

165752421 is a deficient number, since it is larger than the sum of its proper divisors (64859739).

165752421 is a wasteful number, since it uses less digits than its factorization.

165752421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402235.

The product of its digits is 16800, while the sum is 33.

The square root of 165752421 is about 12874.4872130893. The cubic root of 165752421 is about 549.3131050285.

The spelling of 165752421 in words is "one hundred sixty-five million, seven hundred fifty-two thousand, four hundred twenty-one".