665650152 has 24 divisors (see below), whose sum is σ = 1802802690. Its totient is φ = 221883360.

The previous prime is 665650127. The next prime is 665650157. The reversal of 665650152 is 251056566.

It is a happy number.

665650152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 547840836 + 117809316 = 23406^2 + 10854^2 .

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 (36).

It is not an unprimeable number, because it can be changed into a prime (665650157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4622499 + ... + 4622642.

Almost surely, 2^665650152 is an apocalyptic number.

It is an amenable number.

665650152 is an abundant number, since it is smaller than the sum of its proper divisors (1137152538).

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

665650152 is a wasteful number, since it uses less digits than its factorization.

665650152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9245153 (or 9245146 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 665650152 is about 25800.1967434359. The cubic root of 665650152 is about 873.1362351994.

The spelling of 665650152 in words is "six hundred sixty-five million, six hundred fifty thousand, one hundred fifty-two".