165851423040 has 112 divisors (see below), whose sum is σ = 526661847360. Its totient is φ = 44220026880.

The previous prime is 165851423039. The next prime is 165851423057. The reversal of 165851423040 is 40324158561.

It is a self number, because there is not a number n which added to its sum of digits gives 165851423040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9409756 + ... + 9427364.

Almost surely, 2^165851423040 is an apocalyptic number.

165851423040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165851423040 is an abundant number, since it is smaller than the sum of its proper divisors (360810424320).

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

165851423040 is a wasteful number, since it uses less digits than its factorization.

165851423040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27440 (or 27430 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 165851423040 in words is "one hundred sixty-five billion, eight hundred fifty-one million, four hundred twenty-three thousand, forty".