1197819665 has 16 divisors (see below), whose sum is σ = 1644677760. Its totient is φ = 820385280.

The previous prime is 1197819661. The next prime is 1197819671. The reversal of 1197819665 is 5669187911.

It is not a de Polignac number, because 1197819665 - 2² = 1197819661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1197819661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10145 + ... + 49985.

It is an arithmetic number, because the mean of its divisors is an integer number (102792360).

Almost surely, 2^1197819665 is an apocalyptic number.

It is an amenable number.

1197819665 is a deficient number, since it is larger than the sum of its proper divisors (446858095).

1197819665 is an equidigital number, since it uses as much as digits as its factorization.

1197819665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40712.

The product of its digits is 816480, while the sum is 53.

The square root of 1197819665 is about 34609.5314183824. The cubic root of 1197819665 is about 1062.0145813081.

The spelling of 1197819665 in words is "one billion, one hundred ninety-seven million, eight hundred nineteen thousand, six hundred sixty-five".