1521196866 has 36 divisors (see below), whose sum is σ = 3834039222. Its totient is φ = 434627424.

The previous prime is 1521196861. The next prime is 1521196889. The reversal of 1521196866 is 6686911251.

1521196866 is a `hidden beast` number, since 1 + 521 + 1 + 9 + 68 + 66 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1507691241 + 13505625 = 38829^2 + 3675^2 .

It is not an unprimeable number, because it can be changed into a prime (1521196861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 861475 + ... + 863238.

Almost surely, 2^1521196866 is an apocalyptic number.

1521196866 is an abundant number, since it is smaller than the sum of its proper divisors (2312842356).

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

1521196866 is a wasteful number, since it uses less digits than its factorization.

1521196866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724735 (or 1724725 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1521196866 is about 39002.5238414131. The cubic root of 1521196866 is about 1150.0811199236.

The spelling of 1521196866 in words is "one billion, five hundred twenty-one million, one hundred ninety-six thousand, eight hundred sixty-six".