165061641 has 4 divisors (see below), whose sum is σ = 220082192. Its totient is φ = 110041092.

The previous prime is 165061571. The next prime is 165061651. The reversal of 165061641 is 146160561.

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 a de Polignac number, because none of the positive numbers 2^k-165061641 is a prime.

It is a super-2 number, since 2×165061641² = 54490690659225762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165061599 and 165061608.

It is not an unprimeable number, because it can be changed into a prime (165061651) 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, 27510271 + ... + 27510276.

It is an arithmetic number, because the mean of its divisors is an integer number (55020548).

Almost surely, 2^165061641 is an apocalyptic number.

It is an amenable number.

165061641 is a deficient number, since it is larger than the sum of its proper divisors (55020551).

165061641 is an equidigital number, since it uses as much as digits as its factorization.

165061641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55020550.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 165061641 is about 12847.6317272873. The cubic root of 165061641 is about 548.5489475399.

The spelling of 165061641 in words is "one hundred sixty-five million, sixty-one thousand, six hundred forty-one".