665153412 has 96 divisors (see below), whose sum is σ = 1980109824. Its totient is φ = 168739200.

The previous prime is 665153393. The next prime is 665153431. The reversal of 665153412 is 214351566.

It is an interprime number because it is at equal distance from previous prime (665153393) and next prime (665153431).

It is a super-2 number, since 2×665153412² = 884858122990483488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31362 + ... + 48102.

It is an arithmetic number, because the mean of its divisors is an integer number (20626144).

Almost surely, 2^665153412 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 665153412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990054912).

665153412 is an abundant number, since it is smaller than the sum of its proper divisors (1314956412).

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

665153412 is a wasteful number, since it uses less digits than its factorization.

665153412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16809 (or 16807 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 665153412 is about 25790.5682760190. The cubic root of 665153412 is about 872.9189891356.

The spelling of 665153412 in words is "six hundred sixty-five million, one hundred fifty-three thousand, four hundred twelve".