165052263621 has 16 divisors (see below), whose sum is σ = 253488594944. Its totient is φ = 93572935344.

The previous prime is 165052263589. The next prime is 165052263683. The reversal of 165052263621 is 126362250561.

It is not a de Polignac number, because 165052263621 - 2⁵ = 165052263589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165052263621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165052264621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30940765 + ... + 30946098.

It is an arithmetic number, because the mean of its divisors is an integer number (15843037184).

Almost surely, 2^165052263621 is an apocalyptic number.

It is an amenable number.

165052263621 is a deficient number, since it is larger than the sum of its proper divisors (88436331323).

165052263621 is a wasteful number, since it uses less digits than its factorization.

165052263621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61887000.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 165052263621 in words is "one hundred sixty-five billion, fifty-two million, two hundred sixty-three thousand, six hundred twenty-one".