165840823 has 2 divisors, whose sum is σ = 165840824. Its totient is φ = 165840822.

The previous prime is 165840781. The next prime is 165840841. The reversal of 165840823 is 328048561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165840823 - 2²⁵ = 132286391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165840223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82920411 + 82920412.

It is an arithmetic number, because the mean of its divisors is an integer number (82920412).

Almost surely, 2^165840823 is an apocalyptic number.

165840823 is a deficient number, since it is larger than the sum of its proper divisors (1).

165840823 is an equidigital number, since it uses as much as digits as its factorization.

165840823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 165840823 is about 12877.9199795619. The cubic root of 165840823 is about 549.4107441184.

The spelling of 165840823 in words is "one hundred sixty-five million, eight hundred forty thousand, eight hundred twenty-three".