1666749952 has 80 divisors (see below), whose sum is σ = 3909169440. Its totient is φ = 694960128.

The previous prime is 1666749949. The next prime is 1666749991. The reversal of 1666749952 is 2599476661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1666749893 and 1666749902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126324 + ... + 138892.

It is an arithmetic number, because the mean of its divisors is an integer number (48864618).

Almost surely, 2^1666749952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666749952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954584720).

1666749952 is an abundant number, since it is smaller than the sum of its proper divisors (2242419488).

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

1666749952 is an equidigital number, since it uses as much as digits as its factorization.

1666749952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12631 (or 12615 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The square root of 1666749952 is about 40825.8490664922. The cubic root of 1666749952 is about 1185.6508503040.

The spelling of 1666749952 in words is "one billion, six hundred sixty-six million, seven hundred forty-nine thousand, nine hundred fifty-two".