165987552 has 24 divisors (see below), whose sum is σ = 435717576. Its totient is φ = 55329152.

The previous prime is 165987551. The next prime is 165987559. The reversal of 165987552 is 255789561.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165987551) 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, 864423 + ... + 864614.

It is an arithmetic number, because the mean of its divisors is an integer number (18154899).

Almost surely, 2^165987552 is an apocalyptic number.

165987552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165987552 is an abundant number, since it is smaller than the sum of its proper divisors (269730024).

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

165987552 is a wasteful number, since it uses less digits than its factorization.

165987552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729050 (or 1729042 counting only the distinct ones).

The product of its digits is 756000, while the sum is 48.

The square root of 165987552 is about 12883.6156415814. The cubic root of 165987552 is about 549.5727282116.

The spelling of 165987552 in words is "one hundred sixty-five million, nine hundred eighty-seven thousand, five hundred fifty-two".