1538666000 has 80 divisors (see below), whose sum is σ = 3730142208. Its totient is φ = 613872000.

The previous prime is 1538665993. The next prime is 1538666011. The reversal of 1538666000 is 6668351.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1045265 + ... + 1046735.

Almost surely, 2^1538666000 is an apocalyptic number.

1538666000 is a gapful number since it is divisible by the number (10) 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 1538666000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865071104).

1538666000 is an abundant number, since it is smaller than the sum of its proper divisors (2191476208).

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

1538666000 is a wasteful number, since it uses less digits than its factorization.

1538666000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017 (or 2001 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1538666000 is about 39225.8333244815. The cubic root of 1538666000 is about 1154.4668116133.

The spelling of 1538666000 in words is "one billion, five hundred thirty-eight million, six hundred sixty-six thousand".