1661195530 has 8 divisors (see below), whose sum is σ = 2990151972. Its totient is φ = 664478208.

The previous prime is 1661195513. The next prime is 1661195531. The reversal of 1661195530 is 355911661.

It can be written as a sum of positive squares in 2 ways, for example, as 1557012681 + 104182849 = 39459^2 + 10207^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1661195530.

It is not an unprimeable number, because it can be changed into a prime (1661195531) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 83059767 + ... + 83059786.

Almost surely, 2^1661195530 is an apocalyptic number.

1661195530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661195530 is a deficient number, since it is larger than the sum of its proper divisors (1328956442).

1661195530 is a wasteful number, since it uses less digits than its factorization.

1661195530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166119560.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 1661195530 is about 40757.7664991594. The cubic root of 1661195530 is about 1184.3323293478.

The spelling of 1661195530 in words is "one billion, six hundred sixty-one million, one hundred ninety-five thousand, five hundred thirty".