165612641 has 4 divisors (see below), whose sum is σ = 165648384. Its totient is φ = 165576900.

The previous prime is 165612619. The next prime is 165612697. The reversal of 165612641 is 146216561.

165612641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 146216561 = 2749 ⋅53189.

It is a cyclic number.

It is not a de Polignac number, because 165612641 - 2²⁶ = 98503777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165612598 and 165612607.

It is not an unprimeable number, because it can be changed into a prime (165612241) 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, 9665 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (41412096).

Almost surely, 2^165612641 is an apocalyptic number.

It is an amenable number.

165612641 is a deficient number, since it is larger than the sum of its proper divisors (35743).

165612641 is an equidigital number, since it uses as much as digits as its factorization.

165612641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35742.

The product of its digits is 8640, while the sum is 32.

The square root of 165612641 is about 12869.0575023970. The cubic root of 165612641 is about 549.1586486022.

The spelling of 165612641 in words is "one hundred sixty-five million, six hundred twelve thousand, six hundred forty-one".