165400642 has 32 divisors (see below), whose sum is σ = 278800704. Its totient is φ = 72940800.

The previous prime is 165400637. The next prime is 165400649. The reversal of 165400642 is 246004561.

It is a self number, because there is not a number n which added to its sum of digits gives 165400642.

It is not an unprimeable number, because it can be changed into a prime (165400649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209773 + ... + 210559.

It is an arithmetic number, because the mean of its divisors is an integer number (8712522).

Almost surely, 2^165400642 is an apocalyptic number.

165400642 is a deficient number, since it is larger than the sum of its proper divisors (113400062).

165400642 is a wasteful number, since it uses less digits than its factorization.

165400642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 165400642 is about 12860.8180921744. The cubic root of 165400642 is about 548.9242244756.

The spelling of 165400642 in words is "one hundred sixty-five million, four hundred thousand, six hundred forty-two".