165378018 has 16 divisors (see below), whose sum is σ = 356198976. Its totient is φ = 50885520.

The previous prime is 165378013. The next prime is 165378019. The reversal of 165378018 is 810873561.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (165378011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060038 + ... + 1060193.

It is an arithmetic number, because the mean of its divisors is an integer number (22262436).

Almost surely, 2^165378018 is an apocalyptic number.

165378018 is an abundant number, since it is smaller than the sum of its proper divisors (190820958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165378018 is a wasteful number, since it uses less digits than its factorization.

165378018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120249.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 165378018 is about 12859.9384912992. The cubic root of 165378018 is about 548.8991954959.

The spelling of 165378018 in words is "one hundred sixty-five million, three hundred seventy-eight thousand, eighteen".