666301440 has 176 divisors, whose sum is σ = 2435962752. Its totient is φ = 152272896.

The previous prime is 666301429. The next prime is 666301453. The reversal of 666301440 is 44103666.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 666301398 and 666301407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104422 + ... + 110618.

Almost surely, 2^666301440 is an apocalyptic number.

666301440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666301440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1217981376).

666301440 is an abundant number, since it is smaller than the sum of its proper divisors (1769661312).

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

666301440 is a wasteful number, since it uses less digits than its factorization.

666301440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232 (or 6214 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 666301440 is about 25812.8154218016. The cubic root of 666301440 is about 873.4209081550.

The spelling of 666301440 in words is "six hundred sixty-six million, three hundred one thousand, four hundred forty".