165129378 has 8 divisors (see below), whose sum is σ = 330258768. Its totient is φ = 55043124.

The previous prime is 165129317. The next prime is 165129389. The reversal of 165129378 is 873921561.

It is a sphenic number, since it is the product of 3 distinct primes.

165129378 is an admirable number.

It is a super-2 number, since 2×165129378² = 54535422957333768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13760776 + ... + 13760787.

It is an arithmetic number, because the mean of its divisors is an integer number (41282346).

Almost surely, 2^165129378 is an apocalyptic number.

165129378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

165129378 is a wasteful number, since it uses less digits than its factorization.

165129378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27521568.

The product of its digits is 90720, while the sum is 42.

The square root of 165129378 is about 12850.2676236723. The cubic root of 165129378 is about 548.6239740133.

The spelling of 165129378 in words is "one hundred sixty-five million, one hundred twenty-nine thousand, three hundred seventy-eight".