665425152 has 288 divisors, whose sum is σ = 2384121600. Its totient is φ = 178716672.

The previous prime is 665425151. The next prime is 665425157. The reversal of 665425152 is 251524566.

665425152 is a `hidden beast` number, since 66 + 542 + 5 + 1 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-3 number, since 3×665425152³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665425151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 822124 + ... + 822932.

It is an arithmetic number, because the mean of its divisors is an integer number (8278200).

Almost surely, 2^665425152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665425152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192060800).

665425152 is an abundant number, since it is smaller than the sum of its proper divisors (1718696448).

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

665425152 is a wasteful number, since it uses less digits than its factorization.

665425152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 838 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 665425152 is about 25795.8359430355. The cubic root of 665425152 is about 873.0378462826.

The spelling of 665425152 in words is "six hundred sixty-five million, four hundred twenty-five thousand, one hundred fifty-two".