165006779 has 4 divisors (see below), whose sum is σ = 188579184. Its totient is φ = 141434376.

The previous prime is 165006767. The next prime is 165006799. The reversal of 165006779 is 977600561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977600561 = 7 ⋅139657223.

It is a cyclic number.

It is not a de Polignac number, because 165006779 - 2⁴ = 165006763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165006719) 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, 11786192 + ... + 11786205.

It is an arithmetic number, because the mean of its divisors is an integer number (47144796).

Almost surely, 2^165006779 is an apocalyptic number.

165006779 is a deficient number, since it is larger than the sum of its proper divisors (23572405).

165006779 is an equidigital number, since it uses as much as digits as its factorization.

165006779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23572404.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 165006779 is about 12845.4964481720. The cubic root of 165006779 is about 548.4881665553.

The spelling of 165006779 in words is "one hundred sixty-five million, six thousand, seven hundred seventy-nine".