1521551660 has 24 divisors (see below), whose sum is σ = 3334183776. Its totient is φ = 582158720.

The previous prime is 1521551659. The next prime is 1521551687. The reversal of 1521551660 is 661551251.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653401 + ... + 1654320.

It is an arithmetic number, because the mean of its divisors is an integer number (138924324).

Almost surely, 2^1521551660 is an apocalyptic number.

1521551660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521551660 is an abundant number, since it is smaller than the sum of its proper divisors (1812632116).

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

1521551660 is a wasteful number, since it uses less digits than its factorization.

1521551660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307753 (or 3307751 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1521551660 is about 39007.0719229219. The cubic root of 1521551660 is about 1150.1705254374.

The spelling of 1521551660 in words is "one billion, five hundred twenty-one million, five hundred fifty-one thousand, six hundred sixty".