1666901376 has 128 divisors (see below), whose sum is σ = 5622566400. Its totient is φ = 476250624.

The previous prime is 1666901359. The next prime is 1666901377. The reversal of 1666901376 is 6731096661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666901377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10260 + ... + 58643.

It is an arithmetic number, because the mean of its divisors is an integer number (43926300).

Almost surely, 2^1666901376 is an apocalyptic number.

1666901376 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 1666901376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2811283200).

1666901376 is an abundant number, since it is smaller than the sum of its proper divisors (3955665024).

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

1666901376 is an equidigital number, since it uses as much as digits as its factorization.

1666901376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68933 (or 68915 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 1666901376 is about 40827.7035357121. The cubic root of 1666901376 is about 1185.6867546214.

The spelling of 1666901376 in words is "one billion, six hundred sixty-six million, nine hundred one thousand, three hundred seventy-six".