666553272 has 256 divisors, whose sum is σ = 2249856000. Its totient is φ = 162570240.

The previous prime is 666553259. The next prime is 666553331. The reversal of 666553272 is 272355666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1539168 + ... + 1539600.

It is an arithmetic number, because the mean of its divisors is an integer number (8788500).

Almost surely, 2^666553272 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 666553272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928000).

666553272 is an abundant number, since it is smaller than the sum of its proper divisors (1583302728).

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

666553272 is a wasteful number, since it uses less digits than its factorization.

666553272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 473 counting only the distinct ones).

The product of its digits is 453600, while the sum is 42.

The square root of 666553272 is about 25817.6930030551. The cubic root of 666553272 is about 873.5309322450.

The spelling of 666553272 in words is "six hundred sixty-six million, five hundred fifty-three thousand, two hundred seventy-two".