1521666000 has 480 divisors, whose sum is σ = 5745632256. Its totient is φ = 388800000.

The previous prime is 1521665963. The next prime is 1521666007. The reversal of 1521666000 is 6661251.

It is a happy number.

1521666000 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521666007) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15065950 + ... + 15066050.

Almost surely, 2^1521666000 is an apocalyptic number.

1521666000 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 1521666000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2872816128).

1521666000 is an abundant number, since it is smaller than the sum of its proper divisors (4223966256).

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

1521666000 is a wasteful number, since it uses less digits than its factorization.

1521666000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1521666000 is about 39008.5375270594. The cubic root of 1521666000 is about 1150.1993353265.

The spelling of 1521666000 in words is "one billion, five hundred twenty-one million, six hundred sixty-six thousand".