1661208796 has 24 divisors (see below), whose sum is σ = 3197355840. Its totient is φ = 750397632.

The previous prime is 1661208793. The next prime is 1661208803. The reversal of 1661208796 is 6978021661.

It is a super-2 number, since 2×1661208796² = 5519229327815539232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661208793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337411 + ... + 342298.

It is an arithmetic number, because the mean of its divisors is an integer number (133223160).

Almost surely, 2^1661208796 is an apocalyptic number.

It is an amenable number.

1661208796 is a deficient number, since it is larger than the sum of its proper divisors (1536147044).

1661208796 is a wasteful number, since it uses less digits than its factorization.

1661208796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679773 (or 679771 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1661208796 is about 40757.9292408238. The cubic root of 1661208796 is about 1184.3354819590.

The spelling of 1661208796 in words is "one billion, six hundred sixty-one million, two hundred eight thousand, seven hundred ninety-six".