1666726848 has 112 divisors (see below), whose sum is σ = 4945380000. Its totient is φ = 550416384.

The previous prime is 1666726823. The next prime is 1666726871. The reversal of 1666726848 is 8486276661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1666726794 and 1666726803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183928 + ... + 192776.

Almost surely, 2^1666726848 is an apocalyptic number.

1666726848 is a gapful number since it is divisible by the number (18) 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 1666726848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2472690000).

1666726848 is an abundant number, since it is smaller than the sum of its proper divisors (3278653152).

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

1666726848 is a wasteful number, since it uses less digits than its factorization.

1666726848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8979 (or 8963 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 1666726848 is about 40825.5661075263. The cubic root of 1666726848 is about 1185.6453718970.

The spelling of 1666726848 in words is "one billion, six hundred sixty-six million, seven hundred twenty-six thousand, eight hundred forty-eight".