165315363440 has 20 divisors (see below), whose sum is σ = 384358220184. Its totient is φ = 66126145344.

The previous prime is 165315363439. The next prime is 165315363443. The reversal of 165315363440 is 44363513561.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165315363443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033220942 + ... + 1033221101.

Almost surely, 2^165315363440 is an apocalyptic number.

165315363440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165315363440 is an abundant number, since it is smaller than the sum of its proper divisors (219042856744).

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

165315363440 is a wasteful number, since it uses less digits than its factorization.

165315363440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066442056 (or 2066442050 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 165315363440 in words is "one hundred sixty-five billion, three hundred fifteen million, three hundred sixty-three thousand, four hundred forty".