1666428456 has 240 divisors, whose sum is σ = 5364475200. Its totient is φ = 431027520.

The previous prime is 1666428431. The next prime is 1666428473. The reversal of 1666428456 is 6548246661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 6972385 + ... + 6972623.

It is an arithmetic number, because the mean of its divisors is an integer number (22351980).

Almost surely, 2^1666428456 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 1666428456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2682237600).

1666428456 is an abundant number, since it is smaller than the sum of its proper divisors (3698046744).

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

1666428456 is a wasteful number, since it uses less digits than its factorization.

1666428456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 262 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 1666428456 is about 40821.9114692098. The cubic root of 1666428456 is about 1185.5746128103.

The spelling of 1666428456 in words is "one billion, six hundred sixty-six million, four hundred twenty-eight thousand, four hundred fifty-six".