1666828254 has 64 divisors (see below), whose sum is σ = 4121187840. Its totient is φ = 437650560.

The previous prime is 1666828237. The next prime is 1666828259. The reversal of 1666828254 is 4528286661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666828259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118369 + ... + 131699.

It is an arithmetic number, because the mean of its divisors is an integer number (64393560).

Almost surely, 2^1666828254 is an apocalyptic number.

1666828254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666828254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2060593920).

1666828254 is an abundant number, since it is smaller than the sum of its proper divisors (2454359586).

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

1666828254 is a wasteful number, since it uses less digits than its factorization.

1666828254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13585.

The product of its digits is 1105920, while the sum is 48.

The square root of 1666828254 is about 40826.8080309985. The cubic root of 1666828254 is about 1185.6694168521.

It can be divided in two parts, 166682 and 8254, that added together give a triangular number (174936 = T₅₉₁).

The spelling of 1666828254 in words is "one billion, six hundred sixty-six million, eight hundred twenty-eight thousand, two hundred fifty-four".