1666411056 has 50 divisors (see below), whose sum is σ = 4823080812. Its totient is φ = 555469920.

The previous prime is 1666411051. The next prime is 1666411063. The reversal of 1666411056 is 6501146661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1666411056.

It is not an unprimeable number, because it can be changed into a prime (1666411051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 641610 + ... + 644201.

Almost surely, 2^1666411056 is an apocalyptic number.

1666411056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666411056 is an abundant number, since it is smaller than the sum of its proper divisors (3156669756).

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

1666411056 is a wasteful number, since it uses less digits than its factorization.

1666411056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285831 (or 1285816 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1666411056 is about 40821.6983478150. The cubic root of 1666411056 is about 1185.5704864066.

The spelling of 1666411056 in words is "one billion, six hundred sixty-six million, four hundred eleven thousand, fifty-six".