665998272 has 168 divisors, whose sum is σ = 1982150976. Its totient is φ = 213663744.

The previous prime is 665998231. The next prime is 665998283. The reversal of 665998272 is 272899566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1976088 + ... + 1976424.

Almost surely, 2^665998272 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 665998272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991075488).

665998272 is an abundant number, since it is smaller than the sum of its proper divisors (1316152704).

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

665998272 is a wasteful number, since it uses less digits than its factorization.

665998272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 462 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 665998272 is about 25806.9423217862. The cubic root of 665998272 is about 873.2884188518.

The spelling of 665998272 in words is "six hundred sixty-five million, nine hundred ninety-eight thousand, two hundred seventy-two".