666465280 has 352 divisors, whose sum is σ = 1980840960. Its totient is φ = 212336640.

The previous prime is 666465271. The next prime is 666465287. The reversal of 666465280 is 82564666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666465287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21498865 + ... + 21498895.

Almost surely, 2^666465280 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 666465280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990420480).

666465280 is an abundant number, since it is smaller than the sum of its proper divisors (1314375680).

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

666465280 is a wasteful number, since it uses less digits than its factorization.

666465280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 666465280 is about 25815.9888441253. The cubic root of 666465280 is about 873.4924921485.

The spelling of 666465280 in words is "six hundred sixty-six million, four hundred sixty-five thousand, two hundred eighty".