666235416 has 128 divisors (see below), whose sum is σ = 2084544000. Its totient is φ = 172385280.

The previous prime is 666235397. The next prime is 666235433. The reversal of 666235416 is 614532666.

It is a congruent number.

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, 644436 + ... + 645468.

It is an arithmetic number, because the mean of its divisors is an integer number (16285500).

Almost surely, 2^666235416 is an apocalyptic number.

666235416 is a gapful number since it is divisible by the number (66) 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 666235416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042272000).

666235416 is an abundant number, since it is smaller than the sum of its proper divisors (1418308584).

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

666235416 is a wasteful number, since it uses less digits than its factorization.

666235416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1405 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 666235416 is about 25811.5364904920. The cubic root of 666235416 is about 873.3920580263.

The spelling of 666235416 in words is "six hundred sixty-six million, two hundred thirty-five thousand, four hundred sixteen".