1666242256 has 60 divisors (see below), whose sum is σ = 3779620068. Its totient is φ = 709502976.

The previous prime is 1666242251. The next prime is 1666242269. The reversal of 1666242256 is 6522426661.

It can be written as a sum of positive squares in 2 ways, for example, as 1170734656 + 495507600 = 34216^2 + 22260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666242251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116320 + ... + 129856.

Almost surely, 2^1666242256 is an apocalyptic number.

1666242256 is a gapful number since it is divisible by the number (16) 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 1666242256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889810034).

1666242256 is an abundant number, since it is smaller than the sum of its proper divisors (2113377812).

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

1666242256 is a wasteful number, since it uses less digits than its factorization.

1666242256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13716 (or 13703 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 1666242256 is about 40819.6307675608. The cubic root of 1666242256 is about 1185.5304540558.

The spelling of 1666242256 in words is "one billion, six hundred sixty-six million, two hundred forty-two thousand, two hundred fifty-six".