1666120050 has 288 divisors, whose sum is σ = 5419742400. Its totient is φ = 375217920.

The previous prime is 1666120039. The next prime is 1666120063. The reversal of 1666120050 is 500216661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1666119996 and 1666120023.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5887209 + ... + 5887491.

It is an arithmetic number, because the mean of its divisors is an integer number (18818550).

Almost surely, 2^1666120050 is an apocalyptic number.

1666120050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666120050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2709871200).

1666120050 is an abundant number, since it is smaller than the sum of its proper divisors (3753622350).

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

1666120050 is a wasteful number, since it uses less digits than its factorization.

1666120050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1666120050 is about 40818.1338377932. The cubic root of 1666120050 is about 1185.5014701798.

It can be divided in two parts, 166 and 6120050, that added together give a palindrome (6120216).

The spelling of 1666120050 in words is "one billion, six hundred sixty-six million, one hundred twenty thousand, fifty".