2405943666 has 192 divisors, whose sum is σ = 6857809920. Its totient is φ = 592842240.

The previous prime is 2405943653. The next prime is 2405943667. The reversal of 2405943666 is 6663495042.

It is not an unprimeable number, because it can be changed into a prime (2405943667) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1260685 + ... + 1262591.

It is an arithmetic number, because the mean of its divisors is an integer number (35717760).

Almost surely, 2^2405943666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2405943666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3428904960).

2405943666 is an abundant number, since it is smaller than the sum of its proper divisors (4451866254).

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

2405943666 is a wasteful number, since it uses less digits than its factorization.

2405943666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The square root of 2405943666 is about 49050.4196312325. The cubic root of 2405943666 is about 1339.9702351003.

The spelling of 2405943666 in words is "two billion, four hundred five million, nine hundred forty-three thousand, six hundred sixty-six".