665133156 has 36 divisors (see below), whose sum is σ = 1684951632. Its totient is φ = 221230704.

The previous prime is 665133121. The next prime is 665133181. The reversal of 665133156 is 651331566.

665133156 is a `hidden beast` number, since 66 + 513 + 31 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×665133156³ (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 self number, because there is not a number n which added to its sum of digits gives 665133156.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2970 + ... + 36593.

It is an arithmetic number, because the mean of its divisors is an integer number (46804212).

Almost surely, 2^665133156 is an apocalyptic number.

It is an amenable number.

665133156 is an abundant number, since it is smaller than the sum of its proper divisors (1019818476).

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

665133156 is a wasteful number, since it uses less digits than its factorization.

665133156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40040 (or 40035 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 665133156 is about 25790.1755713295. The cubic root of 665133156 is about 872.9101280086.

The spelling of 665133156 in words is "six hundred sixty-five million, one hundred thirty-three thousand, one hundred fifty-six".