165106406 has 4 divisors (see below), whose sum is σ = 247659612. Its totient is φ = 82553202.

The previous prime is 165106373. The next prime is 165106411. The reversal of 165106406 is 604601561.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41276600 + ... + 41276603.

It is an arithmetic number, because the mean of its divisors is an integer number (61914903).

Almost surely, 2^165106406 is an apocalyptic number.

165106406 is a deficient number, since it is larger than the sum of its proper divisors (82553206).

165106406 is an equidigital number, since it uses as much as digits as its factorization.

165106406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82553205.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 165106406 is about 12849.3737590592. The cubic root of 165106406 is about 548.5985321960.

Adding to 165106406 its reverse (604601561), we get a palindrome (769707967).

The spelling of 165106406 in words is "one hundred sixty-five million, one hundred six thousand, four hundred six".